Mindfulness is a form of meditation that involves focusing all of your attention on your breathing; feeling as the air flows in and out of your body, without judging or being affected by anything inside or around you. Through this technique, you become the observer of your thoughts. Being mindful is about observing without criticism and about being compassionate with oneself.
It gives you the ability to acknowledge sadness and keep yourself from wallowing in the negative thinking patterns that it brings. Essentially, it puts you back behind the steering wheel of your life.