Therapists diagnose and treat mental illness.  Coaches work with clients to overcome obstacles and achieve a goal.  This is of course, an oversimplification but at the very core, that is the main difference. There are many therapists who also offer Life Coaching sessions in order to help their clients with different aspects of their challenges.  However a Life Coach cannot practice therapy without the education, training, and licensing.  Currently, there are no mandates in place for an individual who wants to practice coaching.  However, an ethical coach will obtain certification in a specialty of their choice so don't be afraid to ask your coach about their training and background.