Gambling is a game where players risk something of value on an event that is determined by chance. This can involve anything from scratchcards and fruit machines to betting on lottery tickets or office pools.
It is also possible to play gambling games with non-monetary items, such as marbles and Pogs or Magic: The Gathering cards, but the primary focus is on real money. For example, life insurance is a form of gambling; paying the premium on a policy means placing a bet that one will die within a certain time period.
If you have a problem with gambling, you should consider seeking help.