A tip is a sum of money tendered to certain service sector workers for a service performed or anticipated. Such payments and their size are a matter of social custom. Tipping varies among cultures and by service industry. In some circumstances receiving of tips is illegal. In countries where tipping is the norm, some employers pay workers with the expectation that tips will make up the difference. The practice of tipping is controversial, with numerous criticisms.
Tipping Etiquette Around the World.
(thanks Stanley)
