RNG’s are computerised programs that use complicated algorithms to ensure every spin on the slot is completely fair and random. As a condition of a casino’s licensing, these programs must be must be regularly tested by independent third parties like eCOGRA.
The variance of a slot describes how the slot plays. If a slot pays out small regular wins it means it has a low variance attached, while slots that give fewer but larger wins has a high variance attached.
Also known as RTP (Return to Player), this is the estimated payout rate you can expect from a slot machine. Online slots are normally programmed to payout between 82% and 98% of all wagers paid in by players.