Which term describes manners established by society?

The term that best describes manners established by society is etiquette. Etiquette encompasses the conventional rules and social norms that govern behavior in various contexts, such as dining, communication, and public conduct. It provides guidance on how individuals should behave in social situations to ensure respect and consideration for others.

While norms, culture, and protocol do relate to social behavior, they have distinct meanings. Norms refer to the informal, unwritten rules that guide everyday behavior, which might not be strictly enforced. Culture encompasses a broader spectrum, including beliefs, values, traditions, and behaviors of a group. Protocol specifically pertains to formal procedures and ceremonies, often in professional or diplomatic settings. Etiquette, therefore, directly addresses the manners and behaviors expected in social interactions, making it the most suitable choice for describing societal manners.