Ethics, also known as moral philosophy, is a branch of philosophy that involves systematizing, defending, and recommending concepts of right and wrong behavior. Ethics is also a common term to refer to or define e.g. code of conduct, honourable behaviours, virtues, just actions, etc. Examples are: Work ethics, humanitarian ethics for experimenting on animals, ethics of parenting, doctor-patient ethics, etc.
Questions having the ethics tag refers to ethics in User Experience implementation and design.