Adding discussion forums to your website requires more than just simple webpages. You need programs on the web server to accept forum postings, fetch
existing forum postings from a database, and so on. Fortunately there is
an excellent Free Forum
software available written in PHP. phpBB is a powerful forum system that provides
individual user accounts, forum postings with support for more than just plain
text, message threads and a great deal more. And it’s free and completely open
source. So we recommend it highly.
There’s one important catch with phpBB: you need to keep an eye on the program’s
website and install any upgrades that are released to fix security problems.
Please take this seriously — do not allow your website to be wiped out by a
malicious web “worm” that takes advantage of security holes in older versions of
popular forum software.