Apache is the most popular Web server on the planet.
Apache powers most of the Web .
Apache is written with robustness, performance, security, and standards-conformance in mind. Apache is also extensible - its capabilities can be augmented through the inclusion of other modules that are not part of the core server. Apache's behavior can be tailored to the requirements of individual sites, allowing it to serve the needs of sites small and large. Administrators for modest sites often find the base server perfectly adequate with no modification whatsoever. The immediate result is a dramatic increase in script execution efficiency.