It's all of those things. It's a documentary and it's a book, and it's 3 double CDs

https://www.amazon.com/Beatles-Anthology-DVD-John-Lennon/dp/B00006GEMA

https://www.amazon.com/Beatles-Anthology/dp/0811826848/

https://www.amazon.com/Anthology-1-Beatles/dp/B000002TYX/

https://www.amazon.com/Anthology-2-Beatles/dp/B000002TYZ

https://www.amazon.com/Anthology-3-2-CD-Beatles/dp/B000002TZ2