Gambling involves placing something of value on a random event with the intent of winning something else of value. Often, the odds are set by betting companies and can be found on the ticket of the game. For example, a football match or scratchcard may be offered with odds of 5/1 or 2/1. The player matches their choice of bet with the corresponding odds and then chooses whether to play or not.
There are many reasons for people to gamble, including social interactions and the desire to win money. Some people may also be genetically predisposed to thrill-seeking behaviours and impulsivity, which can lead them to make risky decisions.