Bomb

Ever since the first Zelda game, Link has been privy to the use of explosive balls, named simply Bombs. Kept in a Bomb Bag, and made from Bomb Flowers, by the Goron tribe, these devices will help Link demolish boulders and kill giant bosses, amongst other things.

The Legend of Zelda

The Legend of Zelda: Link's Awakening

The Legend of Zelda: Ocarina of Time

The Legend of Zelda: The Wind Waker

However, on Twilight Princess, different varieties of bombs are avaliable to buy. As well as the regular bombs, there are Water Bombs, which can be used underwater and Bomblings, which works simalary to the Bombchu except that they cannot climb up walls.