The Beatles Anthology was a retrospective, multimedia project released in 1995 consisting of a TV documentary, a three-volume set of double albums, and a book which describes the history of the Beatles.
Paul McCartney, George Harrison and Ringo Starr all participated in the making if the works, which are sometimes referred to collectively as the Anthology project. while John Lennon appears in archival interviews.
With the documentary first broadcast in November 1995, the expanded versions were released on VHS and LaserDisc in 1996. Then on DVD in 2003.
The documentary used interviews with the Beatles and their associates to narrate the history of the band as seen through archival footage and performances. The Anthology book, released in 2000, paralleled the documentary in presenting the group's history through quotes from interviews.
The initial volume of the album set (Anthology 1) was released the same week of the documentary's airdate, with the subsequent two volumes (Anthology 2 and Anthology 3) released in 1996. They included unreleased performances and outtakes presented in roughly chronological order, along with two new songs based on demo tapes recorded by Lennon after the group broke up: "Free as a Bird" and "Real Love", both produced by Jeff Lynne.
(some excerpts taken from: https://en.wikipedia.org/wiki/The_Beatles_Anthology )