Casinos offer games like roulette and slots where you play against the house....

https://telegra.ph/What-Does-Licensed-and-Regulated-by-the-Gambling-Commission-Mean-09-07

Casinos offer games like roulette and slots where you play against the house. Gambling covers any activity risking money for a chance to win, including casino games and betting. Betting means placing a wager on an event, like a football match