A random number generator (RNG) is a program producing an unpredictable sequence of outcomes. Every spin is an independent event: past results do not affect future ones.
Spin independence
Common misconceptions are "the slot has not paid for a while, time to bet more" or "hot tables". Mathematically, each next round has the same odds as the previous one.
Certification
Serious providers test RNGs in independent labs and publish math models. When a game's data is unconfirmed, the honest approach is "unknown" rather than invented figures — a core principle of the VAVADA catalogue.