What is a Web Server?
You'll learn: What a web server is and how it delivers web pages to your browser.
The Core Idea
A web server is both the hardware (a computer) and software (a program) that stores website files and sends them to browsers when requested.
Think of a web server like a restaurant kitchen:
- The hardware is the physical kitchen building with storage
- The software is the chef who takes orders and prepares dishes
- The files (HTML, CSS, images) are ingredients stored in the pantry
- Your browser's request is like placing an order
- The response is the prepared meal delivered to your table
How It Works
When you type a URL into your browser:
- Your browser sends an HTTP request to the web server
- The web server software receives the request and finds the right file
- The server sends back an HTTP response with the file (and a status code like
200 OK) - Your browser displays the page
Remember from our previous lessons: the Request-Response Cycle happens between your browser and a web server. The server is the one saying "200 OK" or "404 Not Found" back to you!
Common Web Server Software
Popular web server programs include:
- Apache - one of the oldest and most widely used
- Nginx - known for speed and efficiency
- Microsoft IIS - for Windows servers
These programs run 24/7 on powerful computers (the hardware), waiting to respond to requests from browsers around the world.
Key Takeaway: A web server is the combination of computer hardware and software that stores website files and responds to HTTP requests from browsers by sending back the requested web pages.