Apache has been around since 1995 and is the main alternative to Microsoft's
Internet Information Server (IIS) web hosting technology on the Windows
platform. When it comes to the Internet as a whole, Apache may actually be
the preferred web hosting technology, since most professional web-hosting
operations use versions of Apache on the Linux operating system to host commercial
client websites.
The popularity of Apache can be directly attributed to three things.
For one, the program's general simplicity and ease of use make basic web hosting
extremely easy. Secondly, like Internet Explorer, Microsoft's IIS
technology suffers and has suffered historically from the fact that it is
directly linked into the Windows operating system. Apache is a standalone program, not patched into the OS on
which it runs, and is also blessed with simple but effective security
measures.