Cheating (also called gulling) is an act of lying, deception, fraud, trickery, imposture, or imposition. Cheating characteristically is employed to create an unfair advantage, usually in one's own interest, and often at the expense of others. Cheating implies the breaking of rules. The term "cheating" is less applicable to the breaking of laws, as illegal activities are referred to by specific legal terminology such as fraud or corruption. Cheating is a primordial economic act: getting more for less, often used when referring to marital infidelity.
Another venue where cheating has occurred is in sport. An implicit agreement exists among participants that they will play by the rules and eschew unfair measures to win. Cheaters violate the spirit and/or the letter of the rules of competition. Examples include Ben Johnson's disqualification for doping in the 1988 Summer Olympics or the admissions of steroid use by former professional baseball players after they have retired, such as José Canseco and Ken Caminiti.