Flutter Jump (known in Super Smash Bros. Melee as Hover) is an ability possessed by and used by various characters – most commonly Yoshi and others – that can be used not only to prolong descent after a jump but to keep a character airborne temporarily. It was originally used in Super Mario World 2: Yoshi's Island.
Super Mario World 2: Yoshi's Island
In Super Mario World 2: Yoshi's Island, Flutter Jumps are used by pressing the "A" button subsequently to a jump. Yoshis doing this jump jump higher and farther.
Super Mario 64 DS
Super Mario Sunshine
Paper Mario: The Thousand-Year Door
In Paper Mario: The Thousand-Year Door, it is used by Mario's partner Yoshi. This Yoshi can use a flutter jump by using the "Y" button while Mario is riding him. The ability is used to travel over larger chasms Mario cannot normally travel over.
Mario & Luigi: Superstar Saga
Mario Power Tennis
In Mario Power Tennis, Yoshi's Offensive Power shot is performing this and a tennis shot that is covered with rainbows.