Gliding is one of Spyro's abilities as a dragon throughout the Spyro series. Gliding allows Spyro to soar across gaps that are considered unreachable by jumping using his wings. This is usually performed after pressing the jump button again in mid-jump. In Ripto's Rage and Year of the Dragon, Spyro can hover in mid-glide by pressing the Triangle Button. This is used to get an extra boost of height at the end of your glide, or stop a glide immediately. In Spyro: A Hero's Tail, Spyro glides at the end of a double jump, but can not hover. Spyro can glide in all spin off games, except Spyro Orange: The Cortex Conspiracy, in which the glide is replaced with a double jump/flutter move, earnable in the first world. In Spyro the Dragon, the player can get a little extra height by pressing the Charge button.
The Legend of Spyro series
Spyro retains his gliding ability in The Legend of Spyro: A New Beginning and The Eternal Night. While the glide is still present in Dawn of the Dragon, the fact that Spyro can fly at anytime makes the ability unnecessary.