Un alias, apodo, seudónimo o sobrenombre es, en esencia, una denominación de persona usada como alternativa a su nombre, al que puede acompañar o reemplazar, pudiendo aplicarse genéricamente a un nombre de pila propio. Suele emplearse con fines de encubrimiento, identificativos, estéticos, afectivos, despectivos o de otro tipo y muchas veces alude a una característica de su físico o de su personalidad, como una afición (véase más abajo Tipos de alias). En informática también se utilizan alias para identificar a la persona que está accediendo a un servicio multiusuario, identificando a dicha persona más cómodamente así que a través desde la codificación técnica equivalente, como una dirección IP, por ejemplo. En estos casos suele emplearse el anglicismo nick (acortamiento de nickname, en inglés), aunque actualmente no está admitido por la RAE.

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A pseudonym (UK pronunciation: /ˈsjuːdənɪm/ SYOO-də-nim and US pronunciation: /ˈsuːdənɪm/ SOO-də-nim) or alias is a name that a person or group assumes for a particular purpose, which can differ from their original or true name (orthonym). Pseudonyms include stage names and user names (both called screen names), ring names, pen names, nicknames, aliases, superhero identities and code names, gamer identifications, and regnal names of emperors, popes, and other monarchs. Historically, they have often taken the form of anagrams, Graecisms, and Latinisations, although there are many other methods of choosing a pseudonym. Pseudonyms are most usually adopted to hide an individual's real identity, as with writers' pen names, graffiti artists' tags, resistance fighters' or terrorists' noms de guerre, and computer hackers' handles. Actors, musicians, and other performers sometimes use stage names, for example, to mask their ethnic backgrounds. In some cases, pseudonyms are adopted because they are part of a cultural or organisational tradition: for example devotional names used by members of some religious institutes, and "cadre names" used by Communist party leaders such as Trotsky and Lenin. A pseudonym may also be used for personal reasons: for example, an individual may prefer to be called or known by a name that differs from their given or legal name, but is not ready to take the numerous steps to get their name legally changed; or an individual may simply feel that the context and content of an exchange offer no reason, legal or otherwise, to provide their given or legal name. A collective name or collective pseudonym is one shared by two or more persons, for example the co-authors of a work, such as Ellery Queen, or Nicolas Bourbaki.

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