A narrow notch, groove, or opening, as in a keyway in a piece of machinery or a slit for a coin in a vending machine. Also: A position in a group, series, or sequence; an assignment, berth, billet, or spot.
Often, slot will indicate how many symbols match to form a win on the reels and how much you will earn for doing so. Typically, slots will also have multiple paylines which give you more chances to land a winning combination and can increase your chances of landing a jackpot or other bonus rounds.
Another important feature of a slot is its stacked symbols. Stacked symbols can take up more than one space on the reel and can significantly increase your chances of forming a winning combo. They can also increase the size of your payout.
Many slot games have a theme and a style of play. The symbols that appear on the reels vary and are generally aligned with the theme. Some slots have wild or scatter symbols and others offer different styles of bonus rounds. Some bonus rounds involve picking items on the screen to reveal credits or prizes. A lot of slots also have animations to accompany their bonus features.