Who was puck?

Puck is a character from William Shakespeare's play "A Midsummer Night's Dream." He is a mischievous fairy who serves Oberon, the king of the fairies, and is known for his playful nature and magical abilities. Puck is responsible for many of the comedic misunderstandings and transformations in the play, particularly through the use of a magical flower that causes characters to fall in love unexpectedly. His famous line, "Lord, what fools these mortals be!" encapsulates his role as an observer and commentator on human folly.