Strange creature with the front body of an eagle and hindquarters of a lion. Godric Gryffindor, the founder of Gryffindor house, may have gotten his name from this beast. The griffin-shaped knocker on the door of Dumbledore’s office may be a pun on Gryffindor’s name.
Griffins are used to guard treasure (FB). There is a statue of a griffin in a corridor in Hogwarts near the girls' bathroom where Harry, Ron, and Hermione faced a Mountain Troll(PS10).
The griffin is a legendary creature which appears in the mythology of many cultures, including Greek and Persian. (Wikipedia)