Deal Or No Deal is a popular game show where contestants choose from sealed briefcases, each containing a different cash amount. The goal is to select a briefcase that holds the highest value while navigating offers from a banker who proposes cash deals to buy the contestant's chosen case. As the game progresses, contestants open other briefcases to reveal their amounts, which helps them gauge the value of their own case. They must decide whether to accept the banker's offer or continue playing, ultimately aiming to win the highest possible cash prize by either accepting a deal or taking their chances.