The
Apache HTTP Server, colloquially called
Apache ( ), 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.