The Ollie is a skateboarding maneuver that involves the rider jumping into the air without using their hands. It was invented by Alan Gelfand in 1978 and has since become one of the most popular tricks in skateboarding. The Ollie is performed by popping the tail of the skateboard off the ground, which causes the board to jump into the air. The rider then uses their back foot to level out the board and land back on the ground.