Acceptance and Commitment Therapy is a form of psychotherapy (talk therapy) that focuses on accepting difficult situations and developing strategies to move forward, instead of becoming stuck.
One of the core principles of ACT is developing and refining your ability to accept the circumstances of your current situation that you cannot or are too difficult to change. Accepting in this case is not the same as "giving in". Instead your therapist will help you to stop wasting energy and getting swamped by things beyond your control, and offset those things by choosing a path and committing to it.
Drawing similarities to mindfulness-based therapies, another aspect of ACT deals with helping you to recontextualize your thoughts, or change how you perceive the thousands of things that run through your head every day. By changing your perspective and not giving all thoughts equal weight, you will hone the skill of acknowledging thoughts without allowing them to have power over you.