Marvel Complete Collections, Marvel Ultimate Collections, and Marvel Complete Epics are large full-color trade paperback collections of previously published Marvel comics, typically containing 300–500 pages.
The "Complete Collection" and "Ultimate Collection" lines collect entire runs of one title, or related titles by one creator, with the use of 'Ultimate' or 'Complete' largely interchangeable.
The "Complete Epic" line collects large crossovers spanning several titles. The initial book solicited was the first volume "X-Men: Complete Age Of Apocalypse" in January 2005, for a 30 March 2005 release.
A year later, and Marvel launched the "Ultimate Collection" line, with "Ultimate X-Men Ultimate Collection" Vol. 1. This combined the original first two trade paperbacks, into a larger volume.
Marvel also publish Epic Collections, which are for full runs of character titles.
Many of the "Complete" and "Ultimate Collections" are out-of-print, however some have been reskinned and reissued as Modern Era Epic Collections – which launched in summer 2023.