Mentioning a "slot type" is making reference to the type of gaming slot offered at an online casino. There are many different slot types including classic slots, video slots, 3D slots, and progressive slots. Each type presents its own special features and functions, all of which can affect your gaming experience. Classic slots have simple graphics and offer a classic gaming experience. Video slots possess more features and bonus games, and often even offer higher quality graphics. 3D slots offer 3D graphics and an even more immersive gaming experience. Progressive slots have an ongoing jackpot that increases on every spin until one lucky winner wins it. It's helpful to understand what slot types are available in order to obtain the best gaming experience possible.