If a slot machine game is available to play on an Internet Connection, it’s an online slot. The first slot machine games on the internet appeared in 1996. Produced by Microgaming, a design company that’s still an industry leader, no one would have thought that is simple game would be part of a multi-billion dollar industry one day. The phrase “online slots” is very generic. It can refer to pretty much any type of game you will find on this list. Online progressive slots are popular, as are licensed games based on video games, movies, and TV shows. 3D slots are popular choices for online players, and what are mobile slots if not a super-portable online slot machine game?