Double personality, also known as multiple personality disorder or dissociative identity disorder, is a mental health condition that involves the existence of two or more distinct personalities within one individual. Some alternative synonyms for this condition include split personality, dual personality, and two-faced personality. It is important to note that these terms are not interchangeable and may not capture the full extent of the condition. The symptoms of double personality can vary widely and may include memory loss, mood swings, dissociative experiences, and difficulty maintaining relationships. Treatment typically includes psychotherapy, medication, and support from healthcare professionals.