One of the most common misconceptions in online gambling is that slot reels "spin" and eventually stop on a symbol. In reality, the outcome of your spin is decided the exact millisecond you press the button. The visual animation of the spinning reels is simply a presentation—a way to build anticipation—of a result that already exists in the system.
This process is powered by a Random Number Generator (RNG). The RNG is a complex algorithm that produces a constant stream of numbers, even when no one is playing. When you click "Spin," the system picks the current number from that stream and maps it to a specific combination of symbols. Because the RNG is truly random, every single spin is a completely independent event. This means that what happened on your previous spin, or the spin of the person playing the same game in another city, has zero influence on what will happen next.