Alohomora is a magic incantation of the charm class that is used to open a locked door, window, or object that is not specifically protected by an anti-alohomora spell. This spell first appears in Harry Potter and the Sorcerer's Stone and is used by Hermione Granger to open a door on the forbidden third floor corridor after they get trapped by Argus Filch's cat, Mrs. Norris. It turns out that there is a large, three-headed dog named Fluffy that is guarding something behind the door that Hermione unlocks.
The spell is taught to first year students at Hogwarts and appears in the Standard Book of Spells, Chapter Seven.
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