What are pedals used for on a harp?

Pedals on a harp are used to change the pitch of the strings, allowing the player to alter the key of the music being played. Each pedal corresponds to a specific note and can raise the pitch of that note by a half step or lower it back to its original pitch. This mechanism enables harpists to play in various keys and facilitates the execution of complex musical passages. Overall, pedals enhance the harp's versatility and expressive capabilities.