Beneath the flashing lights and free drinks, casinos stand on a bedrock of mathematics designed to slowly drain patrons of their hard-earned cash. While a little knowledge of game theory and probability can help players beat the odds, the truth is that almost everyone loses at gambling—at least in the long run.

Casinos are entertainment centers that draw in customers with the promise of fun, a chance to win money and a chance to socialize with friends and family. But despite the lavish hotels, musical shows and shopping centers, they would not exist without games of chance—slot machines, roulette, poker, blackjack, craps and keno.

The mathematically determined odds ensure that the house has a constant advantage over gamblers, which is called the “house edge.” Casinos are able to offer free drinks and food because they collect a small percentage of every bet, a process known as rake.

The best way to beat the house edge is to bet conservatively. If you are a beginner, stick to your own personal bankroll and don’t chase rewards or play beyond your comfort level. It’s also a good idea to set a timer for yourself so you don’t spend more than your budget allows. Taking frequent breaks helps you stay on track and keeps your playing momentum going, preventing you from getting bored.