A slot is a dynamic placeholder that either waits for content (passive) or calls out for it (active). It may be configured to reference an individual repository item or to point to a targeter to fill the slot with content. Slots work in conjunction with renderers to deliver content to the page.

Unlike electromechanical machines that used revolving mechanical reels to display and determine results, modern slot machines use microprocessors. With the advent of this technology, manufacturers can create different probabilities for each symbol on a machine’s reels. This allows them to give players a taste of winning, without having to invest large jackpots.

The pay table of a slot machine lists the number of credits a player can win by hitting certain combinations on the reels. It also indicates whether or not the game has any wild symbols and what their values are. The pay tables are usually displayed above and below the slot’s reels or in a help menu on video slots.

The earliest slot machines had three physical reels with 10 symbols on each. This allowed for 103 = 1,000 possible combinations. Since then, manufacturers have added more reels and increased the number of symbols on each one. This has led to an increased variety of games and features for players. However, they still have to keep in mind that the ultimate outcome of any slot game is determined by Lady Luck.