Defining Personas is an introduction to the usage of “Personas” in User Experience; Helps identifying the user groups of the website we’re developing…by selecting characteristics of those groups.
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A persona (plural personae or personas), depending on the context, can refer to either the public image of one's personality, or the social role that one adopts, or a fictional character. The word derives from Latin, where it originally referred to a theatrical mask. On the social web, users develop virtual personas as online identities. In fan fiction and in online stories, the personas may especially reflect the authors' self-insertion.