The Apache HTTP Server
The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for modern operating systems including UNIX and Windows NT. The goal of this project is to provide a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards.
Apache httpd has been the most popular web server on the Internet since April 1996, and celebrated its 17th birthday as a project in February 2012.
The Apache HTTP Server ("httpd") is a project of The Apache Software Foundation.