When you walk into a casino, the music blaring and coins clinking make it clear that the place is designed to be exciting. And the crowds are, too: From regulars who strut their stuff in confidence to those hoping to win back what they lost, most people at a casino have one thing in common: They want to gamble.

The most popular casino games are slots and table games. Casinos earn the majority of their money from these games, which do not require any skill. You put in money, pull a handle or push a button and then watch as bands of colored shapes roll on reels (actual physical ones or a video representation). If the right pattern appears, you win a predetermined amount. Some casinos even have high-tech “eyes-in-the-sky” surveillance systems that can adjust to focus on patrons and track suspicious behavior.

Casinos also encourage people to gamble by offering free food, rooms for the night and other amenities to “good” players. The best way to avoid getting carried away is to set a budget and stick with it. You can also try putting your gambling money into an envelope for each day, so you don’t start spending more than you’re supposed to.