Hold percentage, at its most basic definition, is the portion of money gambled that a casino keeps. That number varies significantly from casino to casino, how a machine is played, and the amount bet on a particular game.
These are casino games where players bet on the outcome of a 'spin'. The goal is to match the symbols on the reels. If they match, you win! Online slots are popular because of their different themes, bonus features and the convenience of playing anytime, anywhere.