Online slots have evolved significantly over the years. Whereas land-based fruit machines were only produced by a few manufacturers, today over 100 companies are developing slot games. While some of these smaller companies have limited offerings, there are some big names that are able to offer a vast array of games. For example, the leading software provider Microgaming offers over 500 different slots. In total, there are over 5000 online slots.

Most online casinos will offer generous welcome bonuses, as well as other great promotions for returning players. In addition, these online casinos usually feature free slots, deposit bonus rounds, and jackpot slots with the biggest payouts. Many of them also accept Bitcoin and other cryptocurrencies as payment options. Therefore, if you’re looking to play for real money, you’ll want to find a site that can accommodate the currency you choose.

Another factor to consider is the return on investment (ROI). Many beginners assume that all slots are the same, but this isn’t the case. Slots differ by their graphics, bonus rounds, and pay-out percentages. You want to play machines with a higher RTP (Return to Player) so that you have a better chance of winning.

The most popular online slots have an impressive return-to-player percentage and a low edge. Many of these games also have impressive graphics. In fact, some of them offer up to 50 free spins.