Dissociation is something all minds do at some level & is one of the minds way of coping with stress when it gets too great.
In it's simple form it's like when you are driving down the highway & realize you dont remember the last few miles & dont know exactly where you are. It's when you mentally leave yourself & mentally are in a totally different place....(where depersonalization is similar except that is like watching yourself in a movie from above where you actually are) .

Dissociation can happen when we are put into a painful situation physical or mental & its the minds way of escaping to another place. While on returning there is no memory of having gone or what was done during that time.
This is generally what it's about & how it can feel.

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