Slot means a narrow, elongated depression, hole, notch, or slit, especially one for receiving or admitting something, such as a coin or a letter. The word is also used of the interior position or job, such as a time slot in a broadcasting schedule, held by someone who fills that role on a regular basis.

The history of slot machines began in the 19th century with a company called Sittman and Pitt that created what was considered to be the first machine. This contraption had five drums filled with playing cards, and winning was accomplished by lining up poker hands. The next big innovation was the introduction of electricity. The electromechanical slot machines that followed allowed players to pull a lever to spin the reels, and then push a button to initiate a payout.

More recently, advances in computer technology have led to the development of online slots that are operated using random number generators. Many of these newer slot games are designed to be more interactive than traditional casino games, with some offering advanced bonus features and 3D graphics.

Some of these slots have progressive jackpots that increase in size as players place wagers. Others feature special symbols that can trigger bonus levels or open a jackpot level. Still others offer a variety of game themes, such as movies or popular television shows like Deal or No Deal. This variety of options means there is a slot machine out there for every type of player.