The Apache HTTP Server, commonly referred to simply as Apache, is one of the most widely used web servers.

Apache is developed and maintained by an open community of developers under the auspices of the Apache Software Foundation. The application is available for a wide variety of operating systems including Microsoft Windows, Novell NetWare and Unix and Unix-like operating systems such as FreeBSD, Linux, Solaris and Mac OS X. Released under the Apache License, Apache is free software / open source software.