Underhand
The ball is held in one hand, and a player swings their arm and hits the ball from below.
Overhand
The player throws the ball in the air and swings their arm above their shoulder and makes contact with the ball in mid air.
Spin
An overhand serve where the ball gains topspin through wrist snapping. This spin causes the ball to drop faster than it appears to a passer receiving it.
Floater
An overhand serve where the ball is hit with no spin so that its path becomes unpredictable. This type of serve can be administered while jumping or standing.
Jump Serve
An overhand serve where the ball is first tossed high in the air, then the player makes a timed approach and jumps to make contact with the ball. There is usually much topspin imparted on the ball. This is the most popular serve amongst college and professional teams.