Online slots consist of reels, symbols, and paylines. The most basic premise is: a player stakes a bet and clicks spin, the reels spin, and when they stop, if matching symbols fall on an active payline, the game pays out. Winning combinations are usually made up of 3-5+ symbols. The game consists of higher and lower-paying symbols and bonus symbols, which trigger extra game rounds like free spins. The bonus rounds are the most challenging part of the game to reach and have the highest payouts. Slot games used to be physical machines with the symbols painted on the reels and, therefore, a limited number of outcomes. Modern online slots are created by computer software with the reels and outcomes no longer constrained or fixed. Instead, the potential outcomes are programmed, and the game, using a random number generator, randomly selects the outcome of each spin based on the options available. While modern slots have become far more complex with hundreds of thousands of ways to win, the premises remains the same: bet, spin, match symbols, and win.