roulette, (from French: small wheel ), gambling game in which players bet on which red or black numbered compartment of a revolving wheel a small ball (spun in the opposite direction) will come to rest within. Bets are placed on a table marked to correspond with the compartments of the wheel.
Live betting goes by many names. Depending on the sportsbook, you might see it called in-play or in-game betting. They all mean the same thing, which is betting on a contest that's underway. Whereas pre-game bets are processed before a contest starts, live bets happen amid the action.