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The Apache HTTP Server, also known as Apache httpd, is a free and open-source web server software that has been the most popular web server on the Internet for over two decades. It is developed and maintained by a community of developers under the auspices of the Apache Software Foundation. Apache httpd is available for a variety of operating systems, including Unix-like systems, Microsoft Windows, and OpenVMS. It is a powerful and versatile web server that can be used to host a wide variety of websites, from small static websites to large dynamic websites with complex applications.