Formality refers to a set of social rules, customs or conventions that govern behavior in certain situations. It is often associated with strict adherence to protocol and etiquette, as well as an emphasis on proper language, dress, and manners. Formality can also refer to the use of formal language or a more structured approach to communication, such as using titles or addressing someone in a specific way. In general, formality is used to indicate a level of seriousness or importance in social interactions, where certain expectations are set for appropriate behavior and conduct.