Muggle, in the Harry Potter series of books by J. K. Rowling, refers to a person who lacks any sort of magical ability and was not born into the magical world. It differs from the term Squib, which refers to a person without magical abilities but with a magical ancestry, and from the term Muggle-born (or the more offensive mudblood), which refers to a person with magical abilities but without magical parents. Other words also spelled "muggle" have been in use over the years, but they are unrelated to the term used in the Harry Potter series. It first appeared in the opening chapter of the first Harry Potter book, where Harry's uncle is shocked to find himself called a "muggle" by a tiny old man in a violet cloak.
The term Muggle is sometimes used in a pejorative manner in the books. Since "Muggle" refers to a person who is a member of the non-magical community, the Muggles are simply ordinary human beings rather than witches and wizards. According to Rowling, a quarter of the annual Hogwarts intake have two non-magical parents; thus far in canon, there have also been some children known to have been born to one magical and one non-magical parent. Children of this mixed parentage are called Half-bloods (strictly speaking, they are 'Literal Half-bloods'); children with recent Muggle ancestry on the one side or the other are also called Half-bloods.
In the Harry Potter books, non-magical people are often portrayed as foolish, sometimes befuddled characters who are completely ignorant of the Wizarding world that exists in their midst. If, by unfortunate means, non-magical people do happen to observe the working of magic, the Ministry of Magic sends Obliviators to cast Memory Charms upon them causing them to forget the event.
Some Muggles, however, know of the Wizarding world. These include Muggle parents of magical children, such as Hermione Granger's parents, the Muggle Prime Minister (and his predecessors), the Dursley family (Harry Potter's non-magical and only living relatives), and the non-magical spouses of some witches and wizards.
Rowling has said she created the word "Muggle" from "mug", an English term for someone who is easily fooled. She added the "-gle" to make it sound less demeaning and more "cuddly".
Notable Muggles in the series
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