Casinos use elaborate surveillance systems to make sure that everything runs smoothly. Security workers in a separate room watch every table, window and doorway, with cameras that can be adjusted to focus on specific patrons. They can also adjust the focus to see if any player is trying to cheat. If a patron does cheat, they may be spotted and arrested by one of the many security guards roaming the casino floor.
Gambling almost certainly predates recorded history, with primitive protodice and carved six-sided dice found in ancient archaeological sites. But the idea of a central gaming venue offering a wide variety of ways to gamble under one roof didn’t take hold until the 16th century, when a gambling craze swept Europe. Italian aristocrats would often hold private parties at their houses called ridotti to indulge in this new fad. These venues were similar to modern-day casinos, and they were a place where rich people could enjoy themselves with fellow gamblers.