Learn how modern websites and web applications are built. Explore the technologies, tools and workflows that power today's web—from HTML and CSS to React, APIs and deployment.
Every website you visit follows the same basic process. Whether you're opening Google, YouTube, Amazon or Swipe, your browser communicates with a server to request information. The server processes the request and sends the necessary files back to your device, allowing the browser to display the website.
Although this happens in just a few milliseconds, several technologies work together behind the scenes. Understanding how websites work helps you see the bigger picture of web development before learning HTML, CSS and JavaScript.
Modern websites are much more than static pages. They allow users to sign in, watch videos, purchase products and interact with applications in real time. Understanding how the web works helps you understand where different technologies fit into the development process and why frontend and backend development are both important.
A browser is the application you use to access websites.
Popular browsers include:
The browser downloads website files, interprets them and displays the finished webpage on your screen.
A server is a computer that stores websites and applications.
When someone visits a website, the server receives the request and sends the required files back to the browser.
Servers can provide:
Without servers, websites wouldn't be accessible on the internet.
Every website follows the same communication process:
This process usually takes only a fraction of a second.
Modern websites are divided into two main parts.
Frontend — everything users can see and interact with, such as buttons, navigation, images, forms and animations. Frontend developers mainly work with HTML, CSS, JavaScript, TypeScript, React and Next.js.
Backend — works behind the scenes. It is responsible for processing requests, managing databases, authenticating users, handling payments and running business logic. Users never directly see the backend, but almost every modern website depends on it.
A simple example: you open swipe.com → your browser sends a request → the server receives the request → the server sends back HTML, CSS, JavaScript and images → the browser combines these files and displays the finished website.
If you sign in or submit a form, additional requests are sent to the backend to process your information.
User → Browser (sends a request) → Server (sends a response) → HTML + CSS + JavaScript → Website
This process happens every day when you:
Every modern website follows this same communication model.
Every website is created through communication between a browser and a server. The browser requests information, the server responds with the necessary files and the browser renders the final webpage. Understanding this process provides the foundation for web development and makes it easier to learn HTML, CSS, JavaScript and modern web frameworks.
Every website starts with HTML. HTML, which stands for HyperText Markup Language, is the standard language used to create the structure and content of webpages. It tells the browser what elements should appear on the page, such as headings, paragraphs, images, buttons and links.
Think of HTML as the skeleton of a website. Without it, a webpage would have no structure or content. While HTML doesn't control how a website looks or behaves, it provides the foundation that CSS and JavaScript build upon.
Every webpage on the internet uses HTML. Whether you're building a personal portfolio, an online store or a social media platform, HTML defines the layout and organizes the content. Learning HTML is the first step toward becoming a web developer.
An HTML document is built from elements that describe different parts of a webpage, such as headings, paragraphs, images, buttons, links and lists.
Most HTML elements use an opening tag and a closing tag.
Example: <h1>Welcome to Swipe</h1>
The opening tag tells the browser where the element begins, and the closing tag tells it where the element ends.
Some of the most frequently used elements include:
These elements are the building blocks of every webpage.
Every HTML page follows a basic structure: a <!DOCTYPE html> declaration, an <html> root element containing a <head> (with page metadata like the <title>) and a <body> (with the visible content, like headings and paragraphs).
The browser reads this document from top to bottom before displaying the webpage.
Modern websites use semantic HTML, which means choosing elements that describe their purpose instead of just their appearance.
Examples include:
Semantic HTML improves accessibility, search engine optimization (SEO) and makes code easier to understand.
Although modern frameworks use different syntax, they all generate HTML in the browser.
No matter which framework you use, the final result displayed by the browser is HTML.
HTML is used to create:
Every visible piece of content on a webpage begins as HTML.
HTML is the foundation of every website. It provides the structure and content that browsers display, while CSS adds styling and JavaScript adds interactivity. By understanding HTML elements, document structure and semantic markup, you've learned the first building block of modern web development.
While HTML provides the structure of a webpage, CSS is responsible for its appearance. CSS, which stands for Cascading Style Sheets, controls how elements look by defining colors, fonts, spacing, layouts, animations and much more.
Without CSS, every website would appear as plain black text on a white background. CSS transforms simple HTML into modern, visually appealing and responsive websites that provide a better experience for users.
Good design is about more than making a website look attractive. A well-designed interface improves readability, usability and accessibility, helping users find information quickly and interact with a website more easily. CSS gives developers complete control over how a webpage is presented across different devices.
A selector tells CSS which HTML element should be styled.
Example: h1 { color: blue; }
In this example, every <h1> heading will appear blue.
Every CSS rule consists of a property and a value.
Example: color: blue; · font-size: 32px; · margin: 20px;
Some of the most common properties include:
These properties define how an element should appear on the page.
Every HTML element is treated as a rectangular box.
The Box Model consists of four parts:
Understanding the Box Model is essential for creating clean layouts and controlling spacing between elements.
Modern CSS provides powerful layout systems that make it easy to organize content. The two most common are:
These tools allow developers to create responsive websites with much less code than in the past.
People visit websites on phones, tablets, laptops and desktop computers. CSS allows websites to automatically adapt to different screen sizes using flexible layouts and media queries.
Responsive design ensures that a website looks good and functions properly on every device.
Although frameworks use different technologies, they all rely on CSS for styling. No matter which framework you choose, CSS remains the foundation of web design.
CSS is used to:
CSS is the language that controls the appearance of websites. It styles HTML elements, creates layouts and ensures webpages look great on every device. By understanding selectors, properties, the Box Model and responsive design, you've learned the core concepts that every web developer uses to build modern user interfaces.
HTML provides the structure of a webpage, and CSS controls its appearance. JavaScript is the technology that makes websites interactive. It allows webpages to respond to user actions, update content dynamically and communicate with servers without reloading the page.
As web applications have become larger and more complex, many developers have adopted TypeScript. TypeScript is built on JavaScript but adds features that help developers write safer, more organized and easier-to-maintain code. Today, it has become the preferred choice for many modern frameworks, including React and Next.js.
Modern websites are expected to be fast, interactive and responsive. Features like navigation menus, image sliders, online forms, shopping carts and real-time updates all rely on JavaScript. TypeScript builds on these capabilities by helping developers catch errors early and manage larger projects more efficiently.
JavaScript is a programming language that runs directly in the browser.
It is responsible for adding functionality to websites, including:
Without JavaScript, most modern websites would be static and far less interactive.
TypeScript is a superset of JavaScript that introduces static typing and additional developer tools.
This makes code:
After development, TypeScript is automatically converted into standard JavaScript that browsers can understand.
Today, many professional development teams choose TypeScript because it improves code quality and makes collaboration easier.
JavaScript and TypeScript power countless web applications, including:
They also form the foundation of popular frameworks like React, Next.js, Angular and Vue.
Modern web development often uses frameworks built on JavaScript. Some of the most popular include:
Although these tools work differently, they all rely on JavaScript at their core.
JavaScript and TypeScript are used to:
JavaScript is the programming language that brings websites to life by adding interactivity and dynamic functionality. TypeScript builds on JavaScript by introducing features that make code safer and easier to maintain. Together, they form the foundation of modern web development and power many of today's most popular websites and applications.
As websites became more interactive and complex, managing large amounts of JavaScript became increasingly difficult. To solve this, developers created frontend frameworks. These frameworks provide tools, structures and best practices that make building modern web applications faster, more organized and easier to maintain.
Today, most professional web applications are built using frameworks instead of plain HTML, CSS and JavaScript. Frameworks help developers focus on building features rather than solving the same problems repeatedly.
Modern websites often contain hundreds or even thousands of components. Without a framework, maintaining large applications would quickly become difficult. Frameworks improve organization, encourage reusable code and simplify the development of responsive and scalable applications.
A frontend framework is a collection of tools and libraries that help developers build user interfaces more efficiently.
Instead of creating every feature from scratch, developers use frameworks to speed up development while following proven best practices.
Most modern frameworks use components.
A component is a reusable part of a website, such as:
Instead of writing the same code multiple times, developers build a component once and reuse it throughout the application.
React is one of the world's most popular frontend libraries.
It was developed by Meta and is used to build fast and interactive user interfaces. React introduced component-based development, making large applications easier to organize and maintain.
Many modern companies use React for their websites and applications.
Next.js is a framework built on top of React. It adds powerful features such as:
Because of these features, Next.js has become one of the most popular choices for modern web development.
Frameworks help developers:
Although every framework has its own approach, they all aim to make web development more efficient.
Each framework has different strengths, but they all help developers build modern websites more efficiently.
Frontend frameworks are used to build:
Many of the websites you use every day are powered by frontend frameworks.
Frontend frameworks help developers build modern web applications more efficiently by providing reusable components, better project organization and powerful development tools. React and Next.js have become industry standards because they simplify the creation of fast, scalable and maintainable websites.
While the frontend is everything users see and interact with, the backend works behind the scenes. It processes requests, stores data, manages user accounts and performs tasks that aren't visible in the browser. Without a backend, most modern websites wouldn't be able to support features like logins, online payments or saving user information.
The frontend and backend communicate through APIs (Application Programming Interfaces), allowing websites to send and receive data securely. Together, these technologies power everything from social media platforms to online banking.
Many modern websites are dynamic, meaning their content changes based on user actions. The backend makes this possible by processing information, storing data in databases and sending the correct information back to the frontend. Understanding how the backend works helps you see how complete web applications are built.
The backend is the part of a web application that runs on a server.
Its responsibilities include:
Unlike the frontend, users never interact with the backend directly.
A database stores information so it can be accessed later.
Common examples include:
Whenever you create an account or save information on a website, it is usually stored in a database.
An API (Application Programming Interface) allows different applications or systems to communicate with each other.
For example:
APIs are one of the most important parts of modern web development because they connect the frontend with the backend.
Communication between the frontend and backend follows a simple process: Frontend sends a Request → Backend queries the Database → Backend sends a Response → Frontend displays the result.
This process happens every time you load data, submit a form or log into a website.
Many websites need to verify who a user is before allowing access.
Authentication is used for:
It helps ensure that only authorized users can access certain features or data.
Different technologies can be used, but they all serve the same purpose: processing requests and delivering data.
The backend powers many everyday features:
The backend is responsible for processing requests, storing data and managing the logic behind modern web applications. APIs connect the frontend and backend, while databases store the information that applications need to function. Together, these technologies allow websites to provide dynamic, secure and interactive experiences.
Writing code is only one part of web development. Once a website is finished, it needs to be tested, stored, shared with other developers and published on the internet. This entire process is known as the development workflow.
Professional developers use tools like Git, GitHub and cloud hosting platforms to manage projects, collaborate with teams and deploy websites. These tools help keep projects organized, make teamwork easier and ensure websites can be updated safely over time.
A website isn't useful if it only exists on your computer. Deployment makes your project available to users around the world, while modern development tools help developers track changes, collaborate with others and maintain applications as they grow.
Git is a version control system that tracks changes made to your code.
With Git, developers can:
Git is one of the most important tools in modern software development.
GitHub is an online platform that stores Git repositories.
It allows developers to:
Many employers also use GitHub portfolios when hiring developers.
Deployment is the process of publishing a website so anyone can access it through the internet.
Popular deployment platforms include:
Once deployed, a website receives its own web address and becomes publicly available.
Every website needs a domain and hosting.
A domain is the website's address, such as swipe.com, google.com or github.com.
Hosting is the service that stores your website files and makes them available online. Without hosting, a website cannot be accessed by other users.
Most websites continue to evolve after they're published. Developers regularly:
Modern development is an ongoing process rather than a one-time project.
A typical web development workflow looks like this: Plan → Write Code → Test → Commit with Git → Push to GitHub → Deploy → Website Goes Live.
Although every team has its own workflow, these steps are common across most modern web projects.
Modern development workflows are used to:
Building a website is only the beginning of the development process. Professional developers use tools like Git and GitHub to manage their projects and deployment platforms to publish websites online. By following an organized workflow, developers can build, maintain and improve web applications efficiently throughout their entire lifecycle.