Ethics or moral philosophy is a branch of philosophy that involves systematizing, defending, and recommending concepts of right and wrong conduct. The term ethics derives from Ancient Greek ἠθικός (ethikos), from ἦθος (ethos), meaning 'habit, custom'. The branch of philosophy axiology comprises the sub-branches of ethics and aesthetics, each concerned with values.
The ethical decision is always the fearsome decision. When something matters enough that we are afraid of the consequences — afraid that even the honorable choice could result in harm or loss or sorrow — that’s when ethics are involved.