Conclusion

Apache's flexible architecture and API enable it to be extended to provide additional services and features, including Java Servlets, XML, PHP, ModPerl, FastCGI, SSL, and ASP.
Apache has extensive security features.
su-exec -- enable CGI scripts to run with the user ID of their owner rather than the user ID of the web server
Server-side application development tools and languages -- CGI, Perl, Java, etc.
Virtual hosts -- lets one computer serve as more than one web site
Firewalls
DNS
ActiveX
Javascript
Database connectivity
Style sheets
XML
E-Commerce

Now you can...

Find the latest Apache source code, binaries, and related files

Download and install Apache

Edit Apache's configuration files

Start, stop, and restart the server

Analyze and manage the server log files

Set up the server to execute Common Gateway Interface (CGI) programs

Explain the relationship of the server to its backends such as databases, Perl, XML, etc.

Password-protect web sites or portions of them

Configure the web server to deliver new file types with the Multi-purpose Internet Mail Extension (MIME)

Enable and use the "server-side includes" feature

Work with the architecture of the Hypertext Transport Protocol (HTTP)

See how modules fit into the phases of the server's request processing cycle

Install modules

Use Secure Sockets Layer (SSL) for encryption