About DID

Its called Dissociative Identity Disorder, and it isn't what you see in the movies.

DID is a trauma-related disorder where a person's personality does not solidify in early childhood, but instead remains fragmented, becoming more so as time passes.

Dissociative identity disorder is a severe form of dissociation, a mental process which produces a lack of connection in a person's thoughts, memories, feelings, actions, or sense of identity. Dissociative identity disorder is thought to stem from a combination of factors that may include trauma experienced by the person with the disorder. The dissociative aspect is thought to be a coping mechanism -- the person literally shuts off or dissociates himself from a situation or experience that's too violent, traumatic, or painful to assimilate with his conscious self.

~webMD

Please check out the videos in the side bar (bottom for mobile) for more in-depth explanations.

Our Favorite Analogy

Thinking of a person with DID as a shared social media account is not that far off the mark.
Not everyone is always around, and its hard to tell who's typing unless you know everyone really well.
Some of us can read the message history (remember things) and some of us go through and delete the logs so the others don't know about them, or to protect each other, or sometimes just on accident. It would be like if all your good friends had to share the same account online. They might have a disagreement on who said what to whom, who got to hang out with whom, who's 'turn' it was to be in charge.
Maybe some don't care about social media and only pop in to use the account on a rare occasion when they have to.
Maybe one is more responsible than the others(or just ends up with the job) and manages the account most of the time. All of them are different people, but from the outside no one can really see that. They might tell people 'it was my friend who said that stupid thing, not me, we share an account.' and most may not believe that they actually share an account. I guess the main difference is some of us don't know when we're in control vs when its some one else. Like we want to say about the same thing and both have a keyboard and don't really notice our own keyboard isn't working until we divert to another topic, and they keep typing about the old topic.

Simplest Explination

Informitive Wiki

This wiki is bran new. Its being put together by fellow dissociative disorder havers. Its a great place to start learning!
https://www.dissociative.wiki/