The WWE World Tag Team Title is a championship on the Raw brand. It appears in Smackdown Vs Raw 2006, Smackdown Vs Raw 2007, and Smackdown Vs Raw 2008. It's the tag title for Raw, with it's Smackdown counterpart being the WWE Tag Team Title. Lance Cade and Trevor Murdoch, The Spirit Squad, and The Hardy Boyz are the default champions.
Raw has a decent roster size, but only some are tag teams. While any team can compete for the title, the number of actual teams on Raw are low as they are on Smackdown.