What is a web server?

Overview

Think of a web server as a very patient shop assistant. A visitor asks for a page, the assistant finds the right files, and hands them over. This happens in a fraction of a second, thousands of times a day, without anyone being at a desk.

The word covers two things. The hardware is a computer that stays switched on and connected to the internet. The software is a program such as Nginx or Apache that listens for requests and replies with web pages, images and other files.

You do not need to own or manage a web server to have a website. Most beginners pay a hosting company to run one for them. That service is called web hosting. The company keeps the machine running, patched and connected, and you just upload your site.

Your choice of hosting decides how much of the server you control. Shared hosting puts many small sites on one server and is the cheapest start. A VPS gives you a private slice with more control. A dedicated server is a whole machine for one customer. Most new sites do fine on shared or managed hosting.

A web server only serves what it is given. A simple site is just files. A WordPress site also needs a language such as PHP and a database, so the host must support those. Check this before you buy, not after.

If you are choosing a host, you can ignore which web server software it uses. Look at uptime history, support quality, backups, renewal prices and how easy it is to move away later.

How does a web server work?

When you open a website, your browser and a web server have a short conversation. The browser asks for a page and the server sends it back. Here is that conversation in plain steps.

Step 1: you type an address such as example.com. Your browser asks the domain name system, which works like a phone book, for the numeric address of the server that holds the site.

Step 2: the browser connects to that server and sends a request, usually asking for a page. Modern sites use an encrypted connection, shown as https, so nobody in the middle can read it.

Step 3: the web server software receives the request. For a simple page it finds a file and sends it. For a dynamic site such as WordPress, it hands the request to other software that builds the page from a database first.

Step 4: the server replies with the page and a status code. 200 means success. 404 means the page was not found. 500 means something broke on the server.

Step 5: your browser reads the reply, asks for the extra files it needs such as images and styles, and draws the page. That is why a page with many large images loads slower.

A busy site is not served by one machine alone. Hosts often spread load across several servers and cache copies of pages so most visitors get a fast answer.

Types of web servers explained

A web server is software that listens for HTTP requests and serves web content in response. Several types of web servers are in common use, each with different architectures and strengths. The most widely deployed are Apache, Nginx, Microsoft IIS, and LiteSpeed.

Apache HTTP Server is the longest-established of the major web servers and remains widely used, particularly on shared hosting platforms. Its strength is flexibility: a large module ecosystem lets you add capabilities without recompiling. Its process-based architecture works well for complex, dynamic PHP applications.

Nginx is known for its high performance handling concurrent connections and serving static content. Its event-driven, non-blocking architecture makes it efficient under high load. Nginx is widely used as a standalone web server and as a reverse proxy in front of other application servers.

Microsoft IIS (Internet Information Services) is the web server built into Windows Server. It is used for hosting ASP.NET applications and other Microsoft-stack web projects. IIS is less common for public websites than Apache or Nginx but is widely used in enterprise Windows environments.

LiteSpeed is a commercial web server known for its performance, particularly for PHP applications. It is compatible with Apache configurations (it can read .htaccess files), which makes migration easy. Many shared hosting providers offer LiteSpeed as a premium alternative to Apache. Caddy is a newer, open-source option that automatically manages SSL certificates and is popular for simpler deployments.