Betting on "even" or "odd" in roulette means wagering that the ball will land on an even or odd number. This bet covers all even or odd numbers on the wheel, excluding the green zero (and double zero on American wheels). If the ball lands on a number within the chosen category, the player wins with a payout of 1 to 1. This type of bet offers nearly a 50/50 chance, making it a popular choice for players seeking balanced odds and steady gameplay.