It's a generic term. A word that may refer to any of the following: psychologist, psychiatrist, pastoral counselor, social worker, clergy, life coach, or mental health consultant.
Therapist does a number of things to help heal. Interprets. Reflects. Confronts. Challenges. Comforts. Role plays. Whatever he or she does, including techniques etc., they're geared towards helping smeone to come out different or whole.
More than what he or she does, a foremost element of change and healing is the therapist’s “presence.” It’s who he or she is, regardless of his or her theoretical allegiances, that makes the main difference in a mind and soul in torment.
Psychotherapist/author Dr. Rolls May speaks of presence as a "complete experiencing of the patient's being - not of his symptoms or problems but of his essence. A therapist who is wise, loving, sincere, or inspirational comes fully prepared to enter a patient's world.
Therapist and patient or client are partners in the life journey. Fellow travelers. Equally human.