dissociative identlty disorder is also known as multiple personality disorder. like when there are more than one mental person living inside one body. such as if a person has 3 seperate identites, like one personality who's a teenage, another who's an agressive person, and the last who's a super sweet middle aged person. this is just an example off the top of my head that i made up. i hope this helps, if not maybe check out the DID forum

--Sam