Database prefix

[snakes1100]

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_