A nickname is a familiar or affectionate name given to a person, often based on their characteristics, interests, or personality. Unlike a person's formal name, a nickname can be playful, humorous, or endearing. For example, someone named William might be called Bill or Will by friends and family. Nicknames can also reflect cultural or social contexts. In some cultures, nicknames are commonly used as terms of endearment, while in others, they may signify friendship or camaraderie. Famous individuals, like Michael Jordan, are often known by nicknames such as MJ, which can enhance their public persona.