Dual Personality is a term used to describe someone who exhibits two distinct personalities. There are several synonyms for the term which include, split personality, multiple personality disorder, dissociative identity disorder, and personality fragmentation. Each of these terms describes the literal manifestation of a fractured persona, whereby the individual experiences two or more independent states of being, with different behaviors and attitudes. Although there is a degree of overlap between these terms, each one brings its own nuances to the idea of a fragmented personality. Regardless of the terminology used, the condition can be complex, and requires professional help to address its symptoms and causes.