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The Apache HTTP Server, commonly referred to as Apache is a web server software which yypically run on a Unix-like operating system, and was developed for use on Linux.(Source WikiPedia)

Merriam-Webster Online Dictionary
Apache (noun)
a member of a group of American Indian peoples of the southwestern United States
any of the Athabascan languages of the Apache people
not capitalized French, from Apache Indian
a) a member of a gang of criminals especially in Paris
b) - ruffian
Apache_HTTP_Server (Wikipedia)
Apache HTTP Server
Apache HTTP server logo (2016).svg
Original author(s)Robert McCool
Developer(s)Apache Software Foundation
Initial release1995; 21 years ago (1995)
Stable release2.4.23 (July 4, 2016; 6 days ago (2016-07-04)) [±]
Development statusActive
Written inC,XML
Operating systemUnix-like, Windows
TypeWeb server
LicenseApache License 2.0

The Apache HTTP Server, colloquially called Apache (/əˈpæ/ ə-PA-chee), is the world's most used web server software. Originally based on the NCSA HTTPd server, development of Apache began in early 1995 after work on the NCSA code stalled. Apache played a key role in the initial growth of the World Wide Web, quickly overtaking NCSA HTTPd as the dominant HTTP server, and has remained most popular since April 1996. In 2009, it became the first web server software to serve more than 100 million websites.

Apache is developed and maintained by an open community of developers under the auspices of the Apache Software Foundation. Most commonly used on a Unix-like system (usually Linux), the software is available for a wide variety of operating systems besides Unix, including eComStation, Microsoft Windows, NetWare, OpenVMS, OS/2, and TPF. Released under the Apache License, Apache is free and open-source software.

As of November 2015, Apache was estimated to serve 50% of all active websites and 37% of the top servers across all domains.

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