The document provides an overview of mindfulness, including its history and origins in Buddhism, definitions, constructs and measures, types of mindfulness practices, links to neurobiology, and applications in psychotherapy and treatment of psychiatric illnesses. It traces the concept of mindfulness from ancient Buddhist texts to its modern conceptualization and operationalization in psychological research and clinical practice. Key points covered include the four noble truths of Buddhism, definitions emphasizing present-moment non-judgmental awareness, methods of measuring mindfulness as a trait, state and practice, formal and informal practice types, associated neurobiological changes, and specific mindfulness techniques.