June 21, 2024


A slot is a dynamic placeholder that either waits for content (a passive slot) or can be triggered by a renderer to fill itself with content (an active slot). Slots work in tandem with scenarios and targeters to deliver content to the page.

A machine that accepts coins or, in the case of “ticket-in, ticket-out” machines, paper tickets with barcodes to pay out prizes based on the number of symbols lined up along a specified path (a payline). The slots were invented by Charles Fey in 1899 and grew to be very popular across the United States during the 1920s. However, their popularity led to organized crime involvement and government intervention, and the machines were eventually banned outside of Nevada.

Unlike physical slot machines, which used mechanical reels that could only display so many symbols at a time, modern digital slot machines use an electronic random-number generator to select the positions of the symbols on each reel. The visible reels then spin, but the symbols never actually appear on them – instead, the RNG “picks” the positions and the computer records how many of them were on a winning payline. These results are then compared to the payout table to determine if the player has won a prize. The symbols vary from game to game, but classics include fruits, bells and stylized lucky sevens. Most slot games have a theme, and the symbols and bonus features typically align with it.