Affirmations are short statements of personal belief that are designed to help us feel good about ourselves and our abilities.
They may take many forms, but they must always be written in First Person, be positive, and are written in the present tense. They positively state exactly what we are doing to make our life go the way we want it to.
Other /More definition:
Affirmations refer to genuine and caring responses on the part of the clinician that says to the client that he or she likes a behavior or statement the client has expressed. It is a commonly used skill by clinicians