The induction is the part where the client actually experiences the hypnotic trance.
Milton H Erickson created indirect hypnosis that is suitable for putting a client into a light trance.
However, Dave Elman developed direct hypnosis and is responsible for four of the most popular induction scripts.
The induction serves as the opener, the script that opens the door to the deepner that takes the client into a deeper state of hypnotic trance.