This document provides an overview of mindfulness, including its origins in Buddhist meditation practices, definitions, and relationship to mental health. It discusses key aspects of mindfulness such as presence, non-judgement, and the four foundations of mindfulness meditation. The document also outlines benefits of mindfulness for mental health, mechanisms of action in the brain, and applications in clinical settings including Mindfulness-Based Stress Reduction and therapies for various disorders. It concludes by discussing implementations of mindfulness at the Royal Ottawa Mental Health Centre.