2.1 Browsers, Servers, and Websites
Most people use websites every day without thinking much about how they work. Whether checking email, reading the news, shopping online, or watching videos, every website depends on communication between a browser and a server.
Understanding browsers and servers is one of the most important foundations for understanding how the modern Internet works.
What Is a Website?
A website is a collection of related webpages and resources that are available on the Internet. Websites can contain text, images, videos, applications, and other digital content. Many modern websites also function as applications, allowing users to communicate, collaborate, shop, create content, and access online services.
When people visit a website, they usually enter a web address, also known as a URL, into their browser. The browser then retrieves information from a server and displays it on the user’s device.
Examples of websites include search engines, online stores, social media platforms, educational websites, government services, and web-based applications.
What Is a Browser?
A browser is a software application used to access and view websites.
Common web browsers include:
- Google Chrome
- Mozilla Firefox
- Microsoft Edge
- Apple Safari
- Brave
A browser acts as the user’s gateway to the World Wide Web. Its job is to request information from web servers, receive the information, and display it in a format that people can easily read and interact with.
Although webpages often appear simple, browsers perform a large amount of work behind the scenes. They download files, interpret code, display images, run scripts, and organize content into the webpage seen by the user.
What Is a Server?
A server is a computer that stores information and provides services to other computers across a network.
When someone visits a website, the server receives the request and sends back the files needed to display the webpage.
A server may provide:
- Webpages
- Images
- Videos
- Files
- Code and other website resources
Some websites also connect to databases, user account systems, applications, and other services, which will be explained later in the course.
Many servers operate continuously, responding to requests from users around the world twenty-four hours a day.
Large websites often use hundreds or even thousands of servers working together to handle traffic from millions of users.
How Browsers and Servers Work Together
The relationship between browsers and servers can be compared to a customer visiting a restaurant.
The customer places an order. The kitchen prepares the meal and sends it back to the customer.
Similarly, a browser sends a request for information. The server processes the request and sends back the requested data.
For example, when a user visits a news website:
- The browser sends a request to the server.
- The server processes the request and finds or prepares the needed content.
- The server sends code, media files, and other resources back to the browser.
- The browser interprets the code and displays the page on the screen.
This process usually happens in less than a second.
The Client-Server Model
The interaction between browsers and servers is part of a broader concept known as the client-server model.
A client is a device or application that requests information.
A server is a system that provides information or services.
Web browsing, email, cloud storage, online gaming, and many other Internet services rely on this model.
The client-server model allows resources to be centralized and shared with many users at the same time.
Looking Ahead
Every time a browser communicates with a server, information travels across networks and through multiple systems before reaching its destination.
Understanding how browsers and servers communicate is essential because it forms the foundation for many other Internet technologies. It also helps explain how websites function, how information is delivered around the world, and why protecting those communications is an important part of Internet security.
In the next section, we will examine the communication rules that browsers and servers use to exchange information: HTTP and HTTPS.