Apache would have to have been installed by a user at some point, or a program that was installed required the service.
You install it.
Apache HTTP Server was created in 1995.
Apache httpd Project (Apache Http Web Server)
Apache web server is an HTTP Daemon you can install to deliver content over HTTP. If you're with a webhost, they do the worrying about the web server, all you need to do is upload your stuff to it.
The Apache Bridge is an Apache plugin that integrates an Application server like Oracle's Weblogic with an Apache HTTP server and is usually used in cases in which Apache handles static web pages and Weblogic servlets handle the dynamic content.
Netscape Enterprise Server Apache HTTP Server
The apache http server
Software: Apache is a web server software. It can make your computer a web server. The meaning of the word "apache": It's a term for several culturally related groups of native American in the United States.
you may run into problems but it can be done http://www.blackdot.be/?inc=apache/binaries http://senese.wordpress.com/2007/06/06/installing-apache-on-windows-vista/
If I understand correctly it is because php is primarily a web programming language and Apache is a popular HTTP server.
Mohammed J Kabir has written: 'Apache Server adminstrator's handbook' -- subject(s): Apache (Computer file : Apache Group), Computer programs, Web servers
"Apache" is short for "The Apache Software Foundation". There are many projects overseen by the ASF, though probably the best known one is a web server.
Ben Laurie has written: 'The Apache HTTP Server Project' 'Apache. Installation et mise en oeuvre'