I will try to be short ad possible with sharing my knowledge and opinion about Apache. Pros and cons will be the best way,
1. Popularity. Still number one Web server around internet
2. Well documented and mature product
3. Quite easy to install, easy to configure.
4. Almost all in one solution (build in support of PHP, CGI, PERL)
5. Present in all popular Linux distributions.
6. Compatible with major management systems: Webmin, Fantastico, Cpanel, ISP config. Part of Zend server.
1. Technologically outdated
2. Not good for the single server for many concurrent connections
3. Consumes far more RAM than new generation web servers
4. MOD PHP is very slow solution for PHP requests handling