Core development of the Apache Web server is performed by a group of about 20 volunteer programmers, called the Apache Group.
It runs on 67% of all web servers in the world. It is fast, reliable, and secure. It can be highly customized to meet the needs of many different environments by using extensions and modules.
Most WordPress hosting providers use Apache as their web server software. However, WordPress can run on other web server software as well.
Wondering what is a web server? Well, a web server is as a restaurant host. When you arrive at a restaurant, the host greets you, checks your booking information and takes you to your table. Similar to the restaurant host, the web server checks for the web page you have requested and fetched it for your viewing.
However, A web server is not just your host but also your server. Once it has found the web page you requested, it also serves you the web page. It handles your communications with the website (the kitchen), handles your requests, makes sure that other staff (modules) are ready to serve you. It is also the bus boy, as it cleans the tables (memory, cache, modules) and clears them for new customers.
Have a look at this video it makes the thing clear for you:
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