Written By: Ehsan Jahandarpour

A gratuity (often called a tip) is a sum of money customarily given by a customer to certain service sector workers for the service they have performed, in addition to the basic price of the service. Tips and their amount are a matter of social custom and etiquette, and the custom varies between countries and between settings. In some countries, it is customary to tip servers in bars and restaurants, taxi drivers, hair stylists and so on. However, in some places tipping is not expected and may be discouraged or considered insulting. The customary amount of a tip can be a specific range or a certain percentage of the bill based on the perceived quality of the service given.