It is a way of using EFT with specific traumatic memories. Here’s the basic idea:
When we experience a trauma (which means anytime we go from fight or flight into the freeze response), a part of us splits off to contain the unbearable feelings so that we can carry on and survive.

In Matrix Re-imprinting we see vast negative memories as being held as pictures or holograms in your body-field. Until you transform them you keep tuning into them on a subconscious level and they affect your health, your well-being and your point of attraction. Changing the pictures creates both physical and emotional healing, and enables you to attract more positive experiences into your life. And by tapping on the meridians of the body at the same time, the process is accelerated. It is important to recognize that this process is very different from denying what happened. From a quantum physics point of view we have an infinite number of possible pasts or futures, and it is simply tuning us into ones that are more resourceful, whilst releasing the stress and trauma that we hold in our body-mind and body-field, due to traumatic life events.