In casino gambling, Slot is a game in which symbols on spinning reels can be aligned to win prizes. These games are played in land-based and online casinos. They are the world’s most popular casino games and account for 85 percent of gambling industry profits.

The name Slot comes from the slot machines themselves, which are a type of gambling machine that uses reels and paytables. These machines can be inserted with cash or a paper ticket, called a barcode, that activates the machine and pays out credits if matching symbols appear.

Some machines also include a bonus round where players can increase their winnings by a certain multiplier. Some machines even include high-definition screens and speakers to keep players engaged.

Symbols and Bonus Features

Traditionally, slot machines have a theme, such as a specific aesthetic, location, or character. They also usually contain themed symbols that align with the theme, and bonus features such as scatters and wilds.

RTP (Return to Player)

A slot’s Return to Player refers to how much money it pays out over the long term compared to how much a player spends on the machine. For example, if a slot has a 97% RTP, it means that for every EUR100 a player spends on the machine, it will pay out EUR97 as payouts.


A slot’s volatility is a measure of the risk of losing money playing the game. A low volatility means that the slot is often profitable but the wins are small, while a high volatility indicates that the slot is risky but can be very profitable.