The Apache Web Server is the most widely deployed web server in the world responsible for serving around 50% of all publicly accessible web sites and web applications on the Internet (as of August 2008) and countless other intranet web servers behind corporate firewalls.

The name “Apache Webserver” is a pun on “a patchy webserver”: a name that refers to the web server's origin as a bug-fixed (or “patched”) version of the NCSA webserver. The Apache Webserver is now an Open Source project maintained by the Apache Software Foundation (ASF), a source of numerous other pieces of open source software including the Tomcat Webserver, numerous development tools and libraries used by professional Java developers, and an industry standard set of tools for XML parsing.

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