A web server is, strictly speaking, very much like a normal machine, the one you have at home (though it is much more purpose-built).

Firstly, it is constantly running, 24/7/365, and hooked up to the internet.

Second, it’s custom-made for storing and supporting websites. You can’t play games on it or watch a video, it’s just for websites. Your website is essentially a bunch of files and data under the hood, so it needs a place where it can be safely stored.

There were three fundamental building blocks of the web — the HTTP protocol, HTML, and the URL. The URL describes where a document is and how it can be presented in a consistent way.

HTTP headers are the request to a server for information and the resulting response.