Supervision means seeing a supervisor (more experienced psychologist) for feedback and guidance in working with clients. Supervision is not therapy. The process and relationship is (or at least it's supposed to be) different in several ways. It's a good idea to ask about both supervision and personal therapy. I personally wouldn't really trust a therapist who has gone through the mandatory supervision hours but didn't go through his/her own therapy and all that intensity and honesty of personal work and looking within before working with others.