Acceptance and Commitment Therapy (ACT) gets it name from one of its core messages: accept what is out of your personal control, and commit to action that improves and enriches your life.
The aim of ACT is to maximise human potential for a rich full and meaningful life. ACT (which is pronounced as the word 'act', not as the initials) does this by:
a) teaching you psychological skills to deal with your painful thoughts and feelings effectively – in such a way that they have much less impact and influence over you. (These are known as mindfulness skills.)
b) helping you to clarify what is truly important and meaningful to you - ie your values - then use that knowledge to guide, inspire and motivate you to change your life for the better.