A online slot is a game in which players place wagers and spin the reels to see if they have won. The winnings come when the symbols line up in a row. Online slots offer the same basic features as mechanical slots, but are controlled by random number generators that keep the results fair and unbiased. There are a variety of different types of online slots, including progressive jackpots and games that allow players to win both ways.
The most popular type of online slot is the classic three-reel slot, which offers a simpler gaming experience. These slots are designed to be easy for beginners to learn. They also feature high payouts, especially when played with maximum bet. Several online casinos also have free slots options that let players practice the rules without risking their real money.
Another type of online slot is the branded slot, which is themed after popular culture franchises or TV shows. These slots can feature audio-visual elements from the original source material, making them a fun way to engage with a favorite brand.
In addition to the classic slots, many online casinos also offer progressive and pooled jackpots. These are similar to the traditional lottery, with a prize pool that grows with each bet until one player wins it. The prize money can be worth millions of pounds. Players can find these jackpots on the websites of online casinos, which often have information about the different categories and prizes.