One of the choirs of angels, in Judeo-Christian lore.
Often confused and mislabeled as baby angels.
The Cherub is NOT a baby angel. Baby angels are called Putto
The Hebrew depiction took the form of winged bulls, or sphinx-like creatures with the body of a bull, the head of a man, and feathered wings.
Christianity depicted them as beings with four heads. That of a man, lion, ox, and eagle. It also had four wings.
The most famous example of a depiction of cherubim is the "Mercy Seat", which is either the lid, or ceremonial object that rested on top of, the Ark of the Covenant.
Cupid is NOT a cherub.