A slot is a thin opening or groove in something, especially a piece of machinery. The slots in the wings of an airplane are used for airflow and control. A slot can also refer to a position in a group, series, or sequence of things. For example, someone might be described as in the slot for a certain job.

A casino slot is a machine that takes in money or paper tickets with barcodes. It then spins reels with symbols and pays out credits based on a pay table. Depending on the theme, some machines feature regular objects like fruit or bells, stylized lucky sevens, and other recognizable icons. Other machines have wild multipliers or progressive jackpots. Some have extra features such as free spins, bonus rounds, and extra reels.

The process of developing a slot game includes Unit Testing, Integration Testing and System Testing. These tests check the functionality of each component to ensure it works as intended. They can also find any bugs or glitches before the slot is released to the public.

In computing, a slot is an operation issue and data path machinery surrounding a set of execution units (also known as functional units or FUs). The relationship between the operations in a slot and the pipeline to execute them is explicit. The term is also used for similar mechanisms in very long instruction word (VLIW) computers.