Mores are social norms that are widely observed within a particular society or culture. They determine what is considered morally acceptable or unacceptable within any given culture. Mores are customs, norms, and behaviors that are acceptable to a society or social group. They are not necessarily based on written law and can change over time. Mores are strict in the sense that they determine the difference between right and wrong in a given society, and people may be punished for their immorality, which is commonplace in many societies in the world, at times with disapproval or ostracizing. Cultural definitions of mores often have ethics and morals tied directly to them, unlike other forms of social norms.

The term "mores" comes from the Latin word "mores," which means "customs, manners, morals". Mores are synonymous with the following terms: morals, customs, traditions, and social norms. Examples of mores include dinner etiquette, forms of dress for different occasions, and much more. Mores are rules that cultures and/or societies develop to govern how to behave in social settings. They also tie into morality and help cultures decipher what is right and wrong in the context of their morality.

In summary, mores are the customs, norms, and behaviors that are acceptable to a society or social group. They are strict and determine the difference between right and wrong in a given society. Mores are not necessarily based on written law and can change over time. They are synonymous with morals, customs, traditions, and social norms.