An online slot is a game played on an online casino. It has many features that make it different from a traditional slot machine. Most modern online slots have Auto Play and Fast Play options, which make the games run smoothly and quickly. You can also play free slots before you start playing for real money, which helps you learn the rules and develop strategies. There are also slot tournaments where you can compete against other players to win prizes. In order to win, you have to reach the top of the tournament leaderboard.

In the US, there are twelve licensed slot software developers. Some of these companies supply land-based slots to US casinos, while others specialize in making slots exclusively for online casinos. Williams Interactive, for example, supplies many of the world’s finest casinos with high-quality online slot machines. The company is now part of SG Gaming, which also produces some of the world’s best gambling titles, including Raging Rhino and Epic MONOPOLY II.

Mobile devices are also becoming more convenient for playing online slots. With the growing popularity of portable devices, these games have become accessible to more people than ever.