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Bonus rounds are mini-games you get to play on top of the slot's base game. They can include additional reels, different symbols, sticky wilds, multipliers, picking a prize, etc. Free Spins are the most popular form and are most commonly triggered by hitting a specific combination of symbols.
The only thing that's predetermined is how a bonus round is triggered, e.g., landing a certain number of scatters activates Free Spins. Online slots, including bonus rounds, are governed by random number generators, so anything that happens during the game is random and happens in real-time.
First, you should look for a game with a bonus round, as not all games have them. Then, try out the game in demo mode: playing slots in free mode will let you get a taste of the game, including its bonus rounds and the frequency at which they hit.
Bonus rounds in slots are closely tied to the game's volatility. High-volatility games commonly have fantastic bonus rounds, but they can take a lot of spins, and money, to trigger. For starters, try low-volatility slots that offer bonus rounds more frequently.
It depends on the game. For instance, Free Spins are most commonly triggered by landing three scatter symbols. In some slots, however, bonus rounds are triggered randomly, so it's always best to play them for free to see how often they award bonus games.