Database prefix
 

What is the purpose of this? and should i set a prefix? If i don't set one what would my tables look like?

Example:

1 Database for multiple programs:
Vbulletin & Wordpress

Both have a table called settings, without a prefix, the 2nd program isnt going to complete its install as MySQL will tell you that the settings table already exists & it wont create it.

Adding a prefix to either programs db tables will create instead two tables:

Vbulletin = settings
WP = wp_settings

Both programs will now be able to share the same DB without MySQL complaining that the settings table already exists. So WP would be set up with a prefix of wp_

Thanks for the explanation.

just a question why would someone install wordpress? isn't the blog system that comes with vbulletin pretty good?

It has nothing to do with WP, as the first line of my post stated Example.

If i want to install 10 programs in one database & all those programs have a table in their database called settings, i can give each program a prefix, this allows me to install all the programs in the single database, without the prefix i cant.