How Does a Website Work?
When you open a website like Google, YouTube, or Amazon, everything appears almost instantly. You click buttons, search for information, watch videos, or buy products without thinking about what is happening behind the scenes.
But a website is actually made up of several parts that work together. Understanding these parts is one of the most important foundations of web development.
In this article, we'll learn how a website fundamentally works from a high-level perspective. Don't worry if some of the terms are new, we'll cover each of them in detail in later articles.
A website is mainly made up of four parts:
- Frontend
- Backend
- Database
- Hosting (Server)
Let's understand each one.
What is the Frontend?
The frontend is the part of the website that users can see and interact with.
It includes everything displayed in your browser, such as:
- Text
- Images
- Buttons
- Forms
- Navigation menus
- Videos
- Animations
Whenever you click a button or type into a search box, you're interacting with the frontend. The frontend is usually built using:
- HTML
- CSS
- JavaScript
Think of the frontend as the visible part of a shop that customers walk into.
What is the Backend?
The backend is the part of the website that works behind the scenes. Users cannot see it directly, but it performs all the important tasks that make the website function. Some common responsibilities of the backend include:
- Processing user requests
- Logging users in
- Handling payments
- Sending emails
- Checking permissions
- Communicating with the database
- Returning information to the frontend
Whenever the frontend needs some information, it asks the backend. The backend processes the request and sends back the appropriate response.
What is a Database?
A database is where a website stores its information. For example, a database can store:
- User accounts
- Passwords (stored securely)
- Products
- Blog posts
- Comments
- Orders
- Messages
Instead of saving this information in files, websites usually store it in databases because they are designed to organize, search, update, and manage large amounts of data efficiently. The backend communicates with the database whenever it needs to save or retrieve information.
What is Hosting?
After creating a website, you need a place where it can live. That place is called hosting. Hosting means storing your website on a computer that is connected to the internet all the time.
This special computer is called a server.
Unlike your personal computer, a server is designed to stay online continuously so that people can access the website whenever they want.
What is a Server?
A server is simply a computer whose job is to provide services to other computers. In web development, a server stores your website and sends it to users whenever they request it.
For example, when someone visits your website, the server sends the required files so the browser can display the website.
A server may store:
- Website files
- Images
- Videos
- Backend application
- Databases (sometimes)
- Other resources needed by the website
Large websites often use many servers instead of just one because they receive millions of visitors every day.
How Does Everything Connect Together?
Let's see how these components work together.
- The frontend displays the website to the user.
- If the frontend needs some information, it sends a request to the backend.
- The backend processes the request.
- If required, the backend reads or updates information in the database.
- The backend sends the result back to the frontend.
- The frontend displays the information to the user.
This process happens every time you search for something, log in, submit a form, or perform many other actions on a website.
How Does a User Access a Website?
Now let's understand what happens when you open a website.
Suppose you type: example.com
into your browser.
At first glance, this seems very simple, but several things happen behind the scenes.
Step 1: The Browser Receives the Website Address
The browser receives the website address that you entered. However, computers do not understand names like example.com. They communicate using numbers called IP addresses.
Step 2: DNS Finds the IP Address
This is where DNS comes in. DNS stands for Domain Name System. Its job is to translate a domain name into an IP address.
For example: example.com
might be translated into something like: 93.184.216.34
You don't need to remember these numbers because DNS does that work for you. You can think of DNS as the internet's phone book. You search using a website name, and DNS finds the correct numerical address.
Step 3: The Browser Connects to the Server
Once the browser knows the server's IP address, it connects to that server over the internet. The browser sends a request asking for the website.
Step 4: The Server Processes the Request
The server receives the request. If it's a simple page, it may immediately send the website files. If the page requires data, the backend may communicate with the database before preparing the response.
Step 5: The Server Sends the Response
The server sends the required files and data back to the browser. These files may include:
- HTML
- CSS
- JavaScript
- Images
- Videos
- Other resources
Step 6: The Browser Displays the Website
The browser reads all the received files and displays the webpage on your screen. From the user's perspective, the website appears within a few seconds or even milliseconds.
What is an IP Address?
Every device connected to the internet has an address called an IP address.
Just as every house has a postal address, every computer or server on the internet has an IP address.
This allows devices to find and communicate with each other.
Since IP addresses are difficult for humans to remember, we use domain names instead.
DNS connects these two by translating domain names into IP addresses.
Putting Everything Together
Here is the complete flow in a simplified form:
- You enter a website address in your browser.
- DNS converts the domain name into an IP address.
- The browser connects to the server using that IP address.
- The server receives the request.
- The backend processes the request if needed.
- The backend communicates with the database if data is required.
- The server sends the response back.
- The browser displays the website.