Apache

he Apache HTTP Server (/əˈpætʃi/ ə-PATCH-ee) is a free and open-source cross-platform web server software, released under the terms of Apache License 2.0.

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,[11] quickly overtaking NCSA HTTPd as the dominant HTTP server. In 2009, it became the first web server software to serve more than 100 million websites.