Basically, slots are divided into categories based on the number of reels. A reel is a vertical section on the slot which spins as you hit the spin button. Reels can come with a number of rows, starting from one and upwards. Most 3 reel slots that can be found at online casinos are classic slots, which have 1 or up to 5 active pay lines.
What’s interesting to note is that some providers have 3 reel slots with all of the functions from modern video slots. These games come with a high number of pay lines, bonus features and the potential for big payouts. One provider which has a big number of modern 3 reel slots is Wazdan.