Apache

Apache - Apache is a Unix-based, open-source web server that is used to host most sites on the Internet. Originally, Apache was a Unix product, but now versions for Windows, OS/2 and other platforms exist.

As with most open-source projects, there are numerous add-ons and tailored versions of the server available, which are created using the Apache module API. The name comes from its origins as "a patchy" web server.