An aerial attack (空中攻撃, Midair attack) is any move that is performed in midair that is not a grounded attack or special move. Their official terms vary between titles; they are known as midair attacks in Super Smash Bros. Melee, and air attacks in Brawl and Smash 4. Most aerial attacks deal moderate damage (9%-14%). Aerial attacks can be L-cancelled in SSB and Melee.
The types of aerial attacks are listed below, with a list of their typical uses:
Certain characters with a tether grab also possess a grab aerial, which is used by pressing the grab button. Similarly, characters who can glide possess a glide attack, which is used when attacking out of a glide.
Super Smash Bros. for Wii U digital manual description