A stomp is the second part of a jump that occurs while coming down. The player does not have to jump; a stomp can be activated any time Mario is falling, whether from a ledge, cliff, or Cannon Pipe. If the character stomps on top of an enemy or switch, he/she can defeat the enemy or activate the switch. Stomping on enemies is Mario's primary attack, but it won't work on spiked or fire enemies (if attempted, Mario can take damage). Boos also cannot typically be stomped on in the platformer games, but they can in some other games, such as certain Mario Party minigames. Stomping is also present in Super Smash Bros. Brawl && Super Smash Bros. for Nintendo 3DS / Wii U, where it deals no damage and is known as footstool jumping.
Anyone who can jump has the ability to stomp. In the Mario role-playing games, Mario uses it with a Action Command for extra damage. In the Mario Party series, the player can jump on a rival to stun them briefly, though it is still not as strong as a Ground Pound.