A space or position for a component or device, especially in a computer. A slot is usually a rectangular opening on the motherboard, but it may also be an expansion port (ISA or PCI), or a USB or Gigabit Ethernet socket. The slots on the sides of a motherboard are called expansion slots and provide connections for extra components, such as memory or graphics cards.

A machine used to produce a random sequence of symbols on a screen, for which the player earns credits according to the paytable. The symbols are displayed on reels that rotate when the machine is activated by a lever or button (either physical or on a touchscreen). Slot machines have a wide variety of themes, and bonus features often align with them.

The earliest known slots were mechanical devices that used strips of paper or metal to record combinations. Later, electromechanical devices were developed that recorded results electronically. These devices were more reliable and allowed for higher payouts. Today, the vast majority of slots are electronic and use a computer to generate the random combinations that determine winners.

In the past, people tried to cheat on slot machines by using a monkey paw or a light wand. They also tried to trick the machine by changing the coin into a different type or making back-end deals with casino bosses. Those tactics might have worked in the past, but they’re almost impossible to pull off in modern casinos.

To win at slot, you need to learn how the game works. This means reading the paytable and rules of the game before betting. You also need to know what types of combinations are possible and what the minimum betting level is. It’s best to pick a machine that offers a high RTP, which is the number of winning bets compared to the number of bets made.

There are some exceptions to this rule, but for the most part, it’s a good idea to choose a machine that has a low house edge. These machines are less likely to lose, and they’ll keep you entertained for longer. This is especially true if you play games with progressive jackpots, which can add up very quickly.

In aviation, a slot is a scheduled time for an aircraft to take off or land at an airport, as authorized by air-traffic controllers. Air traffic is often constrained, and slot allocation can make a big difference in the efficiency of an airport or the safety of its passengers. In some cases, airlines are even willing to sell their slot rights. A related concept is flow management, which is based on real-time traffic data and is currently being implemented at several European airports. It has helped cut delays and fuel burn significantly, and it will likely become more common worldwide.