In the Harry Potter book series, a Muggle is a person who lacks any sort of magical ability and was not born in a magical family. Muggles can also be described as people who do not have any magical blood in them. It differs from the term Squib, which refers to a person with one or more magical parents yet without any magical power/ability, and from the term Muggle-born (or the derogatory and offensive term mudblood), which refers to a person with magical abilities but with non-magical parents.