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The Apache HTTP Server, commonly referred to as Apache, is an open-source HTTP server for modern operating systems including UNIX, its variants and Windows. Apache is a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards.

The Apache HTTP Server, commonly referred to as Apache, is web server software notable for playing a key role in the initial growth of the World Wide Web. In 2009 it became the first web server software to surpass the 100 million website milestone. Apache was the first viable alternative to the Netscape Communications Corporation web server (currently named Oracle iPlanet Web Server), and since has evolved to rival other web servers in terms of functionality and performance. Typically Apache is run on a Unix-like operating system.

Apache is developed and maintained by an open community of developers under the auspices of the Apache Software Foundation. Released under the Apache License, Apache is open-source software.

Apache was originally based on NCSA HTTPd code. The NCSA code has since been removed from Apache, due to a rewrite.

Since April 1996 Apache has been the most popular HTTP server software in use. As of January 2012 Apache was estimated to serve 58% of all active websites and 65% of the top servers across all domains.

Apache web server can be quickly and easily installed for development tasks, especially those related to , perl and , using some packages such as .

Latest major release: Apache 2.4 (what's new?)


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