At it's simplest, Talk Therapy often focuses on the way your past experiences, traumas and hurts contribute to the way you think, behave and feel now. Often therapy transitions at some point away from that backwards facing approach to talk about your current functioning and future hopes.
Life Coaching starts with future facing. What is it you want your life to look like in the short and long term? What thoughts and behaviors do you need to modify in order for you to get there?