Final answer:
Multiple personality disorder, which is known as dissociative identity disorder (DID), is characterized by the presence of two or more distinct identities or personality states.
Step-by-step explanation:
Multiple personality disorder is known as dissociative identity disorder (DID) in the DSM-IV. DID is characterized by the presence of two or more distinct identities or personality states that recurrently take control of a person's behavior.
These different identities often have their own mannerisms, behaviors, and memories. Individuals with DID may experience gaps in memory and may exhibit symptoms such as amnesia, depersonalization, and derealization.