A throw is an attack, performed while a character grabs the target, that ends the grab. Throws appear in all installments of Smash. In Super Smash Bros., two types of throws can be performed by pressing left or right on the control stick when grabbing the enemy. In Melee and Brawl, the player can also press up or down on the control stick, triggering two other throws.
Beginning in Melee, some throws have their speeds affected by the grabbed enemy's weight. An easy example is comparing Mario's back throw speed against both Bowser and Jigglypuff (Jigglypuff is thrown about twice as fast).
 In Super Smash Bros.
Throws in Super Smash Bros. are usually attacks of high knockback. However, throws often have low knockback scaling, and as such are poor KO moves. Because of this, they are often followed up with edgeguarding techniques. The main exception to this is Captain Falcon and Jigglypuff, whose forward throws are both used for combos and have very little knockback growth.
In Melee, by contrast, throws are rarely powerful attacks (with a few exceptions, such as Ness' back throw and Mewtwo's back and up throws). The characters now have four different throw types, up, down, front and back. Many throws, usually down throw, have the capacity to combo into subsequent attacks, including grab (repeated use of throw to grab combos are known as chain grabs).
In Brawl, there are even fewer powerful throws than in Melee. For example, Peach's forward throw no longer has reliable KO potential (although her forward throw can KO opponents above 161% if used near the ledge). A couple of throws have still retained their power, such as Ness' back throw. Like in Melee, many throws can be followed up with other attacks, and chaingrabs are still fairly frequent (such as Falco and King Dedede's down throw combos).
 See also