In "A Midsummer Night's Dream," what kind of creature is Puck (Robin Goodfellow)?Is he a spirit?

Puck is a sprite, a creature with magical powers, similar to a pixie or an elf. There are different opinions regarding how harmful Puck is. At worst, he's seen as dangerous and scary. At best, he's viewed as mischievous, not meaning to do anything that would cause significant harm or trouble. Puck is connected, however, to the darkness and the things that go bump during the dark hours of the night. He serves a second purpose in the play by interpreting it for us and commenting on the action of the play.