Link's bomb, a character-specific item, can be thrown at other opponents, where it will explode on impact. The character hit by the bomb will take about 6% damage. If the bomb is dropped, then other characters can pick it up and use it as an item. The bomb can also be caught by other characters. When the bomb is flashing red, that indicates that it is about to explode. If a bomb explodes on the character holding it, then they will take a minor amount of damage. In SSB4, however, if Link hits an enemy with a thrown bomb, he will take no damage even if he is in the blast radius. As the bomb is an item, Link cannot use the move if he is already holding another item. Link's bomb is unique in the fact that it can deal damage to anyone, including the user's team members.
Young Link's Bombs
Young Link's bombs are exactly the same as Link's, but they hit multiple times. They also have a slightly different design and are smaller, making it a smaller projectile hitbox but makes it harder to see when thrown.
Toon Link's Bombs
While the bomb has limited capabilities on its own, it can lead into a Quickdraw after a short hop, and can aid in Toon Link's recovery. If the bomb is dropped, other characters can pick it up and use it as an item. It can also be caught and thrown by other characters. Toon Link can also set the bomb on the ground by dropping it right before landing, or right after a ledge jump.
It is interesting to note that while Link's bombs deal damage to breakable terrain such as the towers of Shadow Moses Island, and the floors of the Skyworld, Toon Link's do not. As the bomb is an item, Toon Link cannot use the move if he is already holding another item. Similar to Link, Toon Link's bombs can also damage team members.
Toon Link's Bombs use graphics from The Legend of Zelda: The Wind Waker.
Special Move customization was added in Super Smash Bros. 4. These are the variations:
If the attack button button is held during an animation where Link/Young Link/Toon Link cannot throw his bomb (such as during a roll, or during the time when he takes out the bomb), it will allow the player to do a forward smash with the C-Stick without throwing the bomb. The bomb can then be thrown after the smash, stunning the opponent and setting the opponent up for a dash attack, slide smash, or a dash attack cancel.
In Brawl, if a Bomb explodes while in knockback, it increases the knockback Link and Toon Link travel. However, if Link or Toon Link use their Grab Air right before it explodes while in knockback (other than the knockback of the Bomb), it cancels all knockback allowing them to survive at percents they'd usually get KO'd for that move. However, it is very situational because it takes 7 seconds for a Bomb to explode and the attack that knocks them has a chance of making them dropping the Bomb. Without Link or Toon Link having a way to force the bomb to explode, there's rarely a chance of pulling it off with a result of surviving longer.
Bomb to Aerial
Bombs can also be used to setup aerial attacks. When a bomb is thrown or z-dropped on a airborne opponent underneath, the opponent will be sent upwards for a guaranteed aerial follow up. The most commonly chosen follow ups are Link's nair for its speed and his dair for its KO power. Toon Link's down air is notable for being a meteor smash. As such a bomb can be used a effective spike setup, provided the opponent is close enough.
In Melee, bombs dropped by Link can explode when hit. This can be useful in that Spin Attack can collide with the bombs and deal damage, to Spin Attack again. However the spin attack must be fresh in order to deal enough damage to detonate the bomb; hitting an opponent with a spin attack merely once before using a bomb recovery will lower the move's damage output too much. Additionally, this does not work effectively in Brawl, as bombs cannot be damaged by the user's attacks to make the bomb explode.
Normally, if a bomb is dropped from midair, it will explode once it hit the ground or an opponent. However, if Link/Young Link/Toon Link drop a bomb extremely close to the ground, the bomb will stay there, similarly to a dropped Hand Grenade. The simplest way to do this is to short hop, then drop it at the opportune moment. It can also be done by dropping it while jumping up through a platform or dropping down from a platform. Occasionally, a platform will be high enough for one of the Link's to just throw up from the ground.
The bomb dash  is a glitch that can be performed in Super Smash Bros. Melee by either Link or Young Link. It is done by taking out a bomb and then short hopping off the stage to grab the ledge. Then, perform an edge hop. Before landing, drop the bomb with Z. Then, perform everything once more and if performed correctly, the bomb should dash across the stage.
Bombs are operated by being placed on the ground, and in several games they can be picked up and thrown: a few seconds after its activation, a bomb starts flashing and finally blows up, creating an explosion that, in addition to destroying walls and obstacles and damaging enemies, can damage even Link himself. They are however much larger than they appear in Smash: rather than holding them in his hand, Link has to carry them above his head with both arms. In most games Link can carry a limited number of bombs in the inventory, though replacements can be dropped by enemies, found in chests or bought in stores.
Link's Giant Bomb custom could be a reference to the Super Bomb which appeared in The Legend of Zelda: A Link to the Past, an enormous bomb which Link has to lug around the overworld and which is required to access specific areas. While the Super Bomb itself made no further appearances, later games introduced similar items like Exploding Barrels.