A narrow notch, groove, or opening, as in a keyway in machinery or a slit for a coin in a vending machine. Also: a position in a group, series, or sequence.
In aviation, a slot (or air-traffic slot) is an allocated time for aircraft to take off or land at an airport during a specified period of the day. The number of slots available at busy airports is limited to prevent repeated delays caused by too many aircraft attempting to take off or land at the same time.
On a slot machine, a player inserts cash or, in “ticket-in, ticket-out” machines, a paper ticket with a barcode, then activates the machine by pressing a button (either physical or virtual) or lever. The reels then spin and stop to rearrange the symbols, awarding credits based on the pay table. Symbols vary by machine, but classics include fruits, bells, and stylized lucky sevens. Modern video slots often feature bonus events that can require trigger symbols to line up on an active payline, and may even have multiple pay lines.
The number of paylines on a slot game can vary; some have as few as one single fixed payline while others have up to 100. Generally speaking, the more paylines you activate, the greater your chances of winning. However, increasing the number of paylines also increases your cost per spin. For this reason, most players opt for a flexible slot that allows them to determine the number of paylines they want to activate.