The Beatles are, quite possibly, the greatest band to ever exist, and most certainly the greatest rock 'n' roll band.
"1" offers insight into the Beatles discography, showcasing all of their number one hits. It's a great introduction for someone new to the Beatles, or as a compilation disc, but many of the most seminal Beatles tracks- such as "Norwegian Wood" and "Lucy in the Sky with Diamonds".
Ultimately, this is a great way to introduce your children- or children around you- to the joy that is the Beatles. However, this shouldn't be taken as a definitive collection, or as a serious gift for a Beatles fan. If you're looking for more concise collection (or something other than a Beatles-related gag gift), "1962-1966" and "1967-1970" (known as the "Red Album" and "Blue Album" collectively) are much better, and offer a wider view of the Beatles