Simple Definition:

Ethics refers to a set of principles or rules that guide people’s behavior, helping them determine what is right or wrong [morally acceptable or unacceptable]. It involves making decisions based on what is considered morally right or wrong in a given situation. For example, if someone finds a lost wallet, ethics would guide them to return it to its rightful owner rather than keeping the money for themselves.

Very Simple Definition:

Ethics is about knowing the difference between right and wrong. It helps people make good choices and do the right thing. For example, if someone sees their friend drop their pencil, ethics would tell them to pick it up and give it back to their friend instead of keeping it for themselves.