A persona (plural personae or personas), in the word's everyday usage, is a social role or a character played by an actor. The word is derived from Latin, where it originally referred to a theatrical mask. The Latin word probably derived from the Etruscan word "phersu", with the same meaning, and that from the Greek (pros?pon). Its meaning in the latter Roman period changed to indicate a "character" of a theatrical performance or court of law, when it became apparent that different individuals could assume the same role, and legal attributes such as rights, powers, and duties followed the role. The same individuals as actors could play different roles, each with its own legal attributes, sometimes even in the same court appearance. According to other sources, which also admit that the origin of the term is not completely clear, persona could possibly be related to the Latin verb per-sonare, literally: sounding through, with an obvious link to the above-mentioned theatrical mask, which often incorporated a small megaphone, as can be seen here http://world4.eu/roman-theatre-masks/.
In the context of the social web, users create virtual persona which are also termed internet or online identities. Personae in fan fiction and stories written through the medium of the internet are often utilised by authors as a means of subtle self-insertion.
In literature the term generally refers to a character established by an author, one in whose voice all or part of a narrative takes place. Poets such as Robert Browning, Ezra Pound, and T. S. Eliot are strongly associated with such narrative voices, as is the writer Luigi Pirandello. These writers understood the term slightly differently and derived its use and meaning from different traditions. Examples of Eliot's personae were Prufrock and Sweeney. Pound developed such characters as Cino, Bertran de Born, Propertius, and Mauberley in response to figures in Browning's dramatic monologues. Whereas Eliot used "masks" to distance himself from aspects of modern life which he found degrading and repulsive, Pound's personae were often poets and could be considered in good part alter-egos. For Pound, the personae were a way of working through a specific poetic problem. In this sense, the persona is a transparent mask, wearing the traits of two poets and responding to two situations, old and new, which are similar and overlapping.
In literary analysis, any narrative voice that speaks in the first person and appears to define a particular character is often referred to as a persona. It is contrasted with a third-person narrative voice, generally taken to be more objective and impersonal. There are borderline cases, such as the "we" that occurs late in Edwin Arlington Robinson's poem "Eros Turannos" and functions something like a chorus in a Greek tragedy, but in general any identifiable narrator whose point of view or manner of speaking clearly distinguishes him or her from the author is considered a literary persona.
Usually the performers assume a role that matches the music they sing on stage, though they may also be composers. Many performers make use of a persona. Some artists create various characters, especially if their career is long and they go through many changes over time. For example, David Bowie initially adopted a role as alien messenger Ziggy Stardust, and later as The Thin White Duke. More than just artistic pseudonyms, the personae are independent characters used in the artist's shows and albums (in this example, The Rise and Fall of Ziggy Stardust and the Spiders from Mars and Station to Station).
However, in music, a persona does not always mean a change. Some authors have noted that Bob Dylan's charisma is due largely to his almost stereotyped image, always with a harmonica, guitar, and with his distinctive hair, nasal voice, and clothing. The persona also serves to claim a right or to draw attention to a certain subject. That is the case of Marilyn Manson and his interest in death and morbidity, and Madonna and her interest in sexuality.
The concept of persona in music was introduced by Edward T. Cone in his The Composer's Voice (1974), that dealt with the relation between the lyrical self of a song's lyrics and its composer. The concept of persona can be used to refer also to an instrumentalist, like a pianist and his playing style, although the term is more commonly used to refer to the voice and performance nuances of a vocalist in a studio album or in a live concert. Examples include Maria Bethânia, Elis Regina, Edith Piaf, Nina Simone, and also Mick Jagger of The Rolling Stones, who takes the guise of Satan in the song "Sympathy for the Devil" or of a housewife in "Slave". Sgt. Pepper's Lonely Hearts Club Band by The Beatles, presents a group persona, including the character Billy Shears "played by" drummer Ringo Starr.
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Artists such as Lady Gaga, Nicki Minaj, and Beyoncé popularized the use of personae in the performance of pop music. Jo Calderone, the persona of Lady Gaga, performed at the 2011 MTV Video Music Awards. Jo represents a drag male persona, and is often used in the performance of her song, "You and I". Nicki Minaj, a bubblegum rapper, employs multiple personae, ranging from what she calls the Harajuku Barbie persona to Roman Zolanski, a Polish homosexual. The personae were heavily used in her sophomoric album, Pink Friday: Roman Reloaded. The persona of Beyoncé Knowles, "Sasha Fierce", appears on the album I Am... Sasha Fierce. According to Beyoncé, Sasha is her wilder side, emerging during high octane stage performances and serving as a sort of scapegoat for "unladylike" behavior.
According to Carl Jung and the Jungian psychology, the persona is also the mask or appearance one presents to the world. It may appear in dreams under various guises. People may choose to wear a social mask or "persona" to make themselves appear more socially desirable. This is used to impress members of the opposite sex or to make new friends. People can have multiple personas that they use in various situations, this can include work, being with friends, at home, etc. Depending on the person stronger personas can be created because they put a higher emphasis on social interactions. However Carl Jung warns about using personas too much fearing that one might lose their own individuality to their persona. A study has shown that this can be true to an extent, when taking a private self-rating test there is a high correlation between how a person rates themselves and how they present themselves in public, but it's hard to tell if people are accurately filling out the test or answering what they find desirable.
In a Study written by Danielle Jackson she claims that a persons persona can range in healthiness, the more healthy a persona is the more socially acceptable and consistent that person is. However once a person starts to believe that they are their persona it can have adverse affects on their personality.James Hillman believed that once a person loses their identity to a persona they become an Archetypal figure. By losing their "ego" their persona becomes their personality in an Archetypal form. However when this occurs the person becomes unstable and they are unable to act outside their formed persona. 
Personas are used in marketing (and advertising) by creating a marketing persona that represents a group or segment of customers so that the company can focus its efforts. For example, online advertising agencies can monitor pictures, browsing history and the ads people surfing the internet generally select or choose to click, and based on that data they tailor their merchandise to a targeted audience or better describe a customer segments using a data driven approach.
Personas are also used in User experience design, known as user personas. Alan Cooper introduced personas in his book, The Inmates Are Running the Asylum (1998). Cooper play-acted fictitious characters in order to help solve design questions. These personas need to be based on user research and can also be described in narrative form. Creating personas has become synonymous with creating a document, known as persona profile, instead of an "activity of empathetic role-play". Personas are widely used in system design organizations as a complement to individual or other user data.
The identification and application of personas improved Development's efficiency and quality during the first development cycle in which they were used. In addition, the use of personas significantly improved corporate cohesiveness, focus and decision making at every level.
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