What is Server Side Scripting?

This includes (but is not limited to) CGI, PHP and SSI. Of these, CGI and PHP are the most useful. You will likely want to use one or the other at some point. With CGI and PHP you can set up guestbooks, mail forms, forums, chat rooms, counters and lots of other cool stuff for your website. SSI is handy, but usually not as necessary as the others.