Hello is a greeting in the English language. It is common between two people in a non-formal (informal) setting, but can also be used in a formal setting. There are also many other ways of saying "hello", for example a wave of the hand, a salute or a bow (both very formal), a handshake (a little formal) or a high five (very informal). Saying "hello" is a sign of politeness, especially when it is said in a friendly way. "Hello" was first used in writing in about 1833.