Hammer

Hammers are a reoccuring item in the Zelda series, and have appeared in several Zelda titles, usually with different names. They are only simply called 'hammer' in The Adventure of Link and in Phantom Hourglass.

The Adventure of Link
In The Adventure of Link, the hammer is found within the maze-like Death Mountain region of western Hyrule. It is used to smash large boulders that are occasionally found in Hyrule's overworld, often unblocking pathways and revealing new objects underneath.

Phantom Hourglass
In Phantom Hourglass, the hammer is the main tool of Mutoh's Temple, and used to pound at objects and enemies. The hammer is controlled by holding and gently moving the stylus pen on the DS screen, which will drag Ciela around as she shows where the hammer will land on, making it possible to pound on objects and enemies that are far away from Link. When held for a while longer, the hammer will grow into a gigantic size and will make a much stronger pound.

There are also several spring boards in certain areas, which will fling Link into the air if he stands on it and pounds against it with his hammer.

Triva

 * The Skull Hammer in The Wind Waker was originally supposed to also be called simply a 'hammer'. It's name was probably changed to later match its appearance.