Hypnotherapy is the use of hypnosis as a therapy to directly access our subconscious mind by bypassing the critical conscious mind.
It is like a traffic light. When hypnosis is in progress, the traffic light turns red (just as the gate at the conscious and subconscious mind is shut). The cars (critical info / judgement) are all waiting at the gate (traffic light) to go over the traffic light. This is like the critical info waiting to enter the subconscious mind.
However the hypnotherapist’s suggestions are only allowed to enter via a small opening (like a small pedestrian walkway). All cars are stopped and not allowed to pass except the pedestrian who can still walk pass the traffic light without obstruction.