An alias is a name that a person or entity uses instead of their real name. This can be for various reasons, such as privacy, security, or creative expression. For example, an author might use a pen name, or a person might adopt a nickname among friends. In the digital world, aliases are often used in online forums, social media, and gaming to protect one's identity. This allows users to interact without revealing personal information. Additionally, in law enforcement, an alias can refer to a name used by a suspect to conceal their identity, which is important for investigations.