A "signature" is a person's name or a mark made by an individual to indicate approval, authenticity, or identity. It is often used on legal documents, contracts, and personal letters to confirm that the signer agrees to the content. Signatures can be handwritten or digital, and they serve as a unique identifier for each person. In many cultures, signatures hold legal significance and can be used in place of a formal agreement. The act of signing is often accompanied by the use of a pen or stylus, and some people develop unique styles that reflect their personality.