The most popular server in the world, Apache features a modular design and supports dynamic selection of extension modules at runtime. Some of its strong points are its range of possible customization, dynamic adjustment of the number of server processes, and a whole range of available modules including many authentication mechanisms, server-parsed HTML, server-side includes, access control, CERN httpd metafiles emulation, proxy caching, etc. Apache also supports multiple virtual homing.
Separate Debian packages are available for PHP3, mod_perl, Java Servlet support, Apache-SSL, and other common extensions. More information is available at http://www.apache.org/.