To the player, a slot machine looks like a series of spinning reels that stop one by one to reveal a combination. However, the reality is entirely digital. The outcome of every single spin is decided the exact millisecond you press the "Spin" button. The animation you see on your screen is simply a visual presentation of a result that has already been determined by the software.
This process is governed by a Random Number Generator (RNG). The RNG is a complex algorithm that generates thousands of numbers every second, even when no one is playing. When you initiate a spin, the RNG provides a value that corresponds to a specific position of symbols on the reels. Because the RNG is truly random, every spin is an independent event. This means that the result of your last spin has absolutely no mathematical influence on your next one; the game does not remember "dry spells" or "winning streaks."