Night of Champions

Concept
The concept of Night of Champions was that every title in the WWE would be on the line in one night. The original concept was all the matches would ONLY be a title match. However, as titles have decreased such as the WWE World Tag Team Titles only being one title instead of having two Tag Team Titles, the Diva's Championship being merged with the WWE Women's Championship, the retirement of the WWE Cruiserweight Championship, etc. all the active titles are on the line with some matches being regular matches with no titles on the line.

Name Change
In 2007, Night of Champions merged with Vengeance to create Vengeance:  Night of Champions, or also known as Night of Champions 2007. In 2008, the WWE dropped Vengeance as a Pay Per View and stuck with just the Night of Champions name which has been a Pay Per View to the present day. Vengeance, however, did return for one night only in 2011, but it was not under a Night of Champions gimmick.