An ethic is a guiding principle or belief about right and wrong that shapes how someone approaches their work, relationships, or life. When someone has a strong work ethic, they believe in doing their job thoroughly and responsibly, showing up on time, and giving honest effort even when no one's watching. A personal ethic might include treating others fairly, keeping promises, or standing up for what's right even when it's difficult.

The word suggests values you've adopted as your own that guide your choices, especially in tough situations. Your ethics are the internal beliefs that shape your decisions when no one is telling you what to do. A scientist's professional ethic might require sharing research honestly, even when the results are disappointing. A player's athletic ethic might mean refusing to bend the rules to win, because victory through cheating isn't real victory.

You'll sometimes hear about the Protestant work ethic, which refers to a cultural belief that hard work, discipline, and responsibility are morally good and practically valuable. This idea influenced how many people in America and Europe came to think about work and success.

Notice that ethics (plural) usually means the formal study of right and wrong, or a system of moral principles, while ethic (singular) typically describes a particular guiding belief or approach.