While it can be a fun pastime, casino gambling has a significant disadvantage – the house always wins. This is because the casino has a built-in advantage – the “house edge”. The house edge is the percentage of profits the casino receives on each game. This disadvantage can increase with the length of time you spend at the casino.

To calculate the house edge, the casino must know how to calculate variance. This tells the casino how much it can expect to profit from the game and how much it should have in its cash reserves. Casinos hire computer programmers and mathematicians to do this analysis. Most casinos don’t have in-house expertise in this field, so they outsource this work to experts.

The house edge is the difference between true odds and casino payouts. It varies by game type and is expressed in percentages. A low house edge casino may only make 0.5% to 2% of every pot, while a high house edge casino will make between 15% and 40% of a pot. The house edge is a key factor when deciding which games to play, as it can influence your chances of winning.

Security at a casino starts on the floor. Security officers keep an eye on all patrons and the games being played. Some dealers are trained to detect blatant cheating. Other employees are called pit bosses, who watch over the table games and watch for betting patterns. These employees are under the supervision of someone higher up.