Charles Fey developed the first commercially successful slot machine in his San Francisco machine shop around 1896. Made of cast iron with three internal reels, a slot for taking in coins and an external lever for activating the machine, it quickly became a staple of saloons, gambling houses and even many retail stores (where patrons would trade their winnings for goods from the store  hence the term "trade goods").

Today, no casino would be complete without the gleaming rows of the one-armed bandits. Slot Machines have expanded from the original design to today's multiple offerings – multi-line slots, video slots, and poker slots have become the new favorites, making the Slot Machine one of the most popular casino games today.