A slot is a container that can hold dynamic content on a Web page. It is connected to a scenario via a signal-slot connection and can wait for a specific item (passive slot) or call out to a repository to get content for it (active slot). Slots are part of the Qt component programming model, along with scenarios and renderers, and work together to deliver a Web site.

In hockey, the area in front of the goaltender between the face-off circles is referred to as the “slot”. The zone above it is known as the high slot. A player may be penalized for violating the slot.

A slot machine is a gambling device that spins reels and pays out winning combinations. In modern casinos, they are usually linked to a central computer and can be programmed to give out various combinations of symbols, including letters, numbers, and other icons. The amount that the slot machine pays out depends on the volatility of the game, with low volatility games paying out more often but smaller wins, while high volatile slots have greater potential for larger payouts.

In aviation, a slot is an air traffic control time allocation given to an aircraft by an airport or European air traffic management center due to congestion, runway closures, or other constraints. This is a fixed window of time in which the aircraft is expected to be cleared for takeoff, and must be used within the specified time period to avoid delay.