What it is
Traumatic memories are often stored in fragments: an image, a sound, a feeling with no context. A trauma narrative pulls those fragments into a story with a beginning, middle and end, including what you thought and felt at the time and what you understand now.
It is part of several evidence-based approaches, including trauma-focused CBT and narrative exposure therapy. Done carefully, it reduces the intensity of the memory and gives you back authorship of your own history.