A slot is a narrow opening or hole in a machine, container, etc. You put something in a slot to use it. For example, you can place coins in a slot to make a machine work. In computers, a slot is an expansion port, such as ISA, PCI, or AGP (accelerated graphics port). A slot can also refer to a position in a series or schedule. For example, you can book a time to meet someone in a specific slot.

A slot on a computer is a container that acts as a dynamic placeholder for content. It can either wait for the content to be called upon (a passive slot) or actively call out to a renderer to fill it with content (an active slot). Slots and scenarios work together to deliver content to your pages; slots have some properties that are particularly important when working with offer management panels.

In a slot machine, the pay line is a sequence of symbols that can be lined up to win a payout. The number of winning combinations varies by game type, and the odds are determined by a combination of factors such as symbol frequency on each reel and the probability of a particular combination appearing on a given reel.

Many modern slot machines allow players to choose the number of pay lines they want in play during a spin. This gives players flexibility in their bankrolls and can help them determine how much they’d like to wager per spin. Historically, however, machines only offered fixed paylines that could not be changed by the player.