The term "mindfulness" simply means being aware of what's happening in the present moment, without trying to change anything. Concentration, on the other hand, is an effort to pay attention to one thing, for a certain amount of time - a single focus. These two processes work together in meditation. As we "meditate" we aim to concentrate on an object, idea, sensation, image or sound. As we do, we are invited to be mindfully aware of changes in our focus, thoughts, or feelings, without judgement. When practicing mindfulness, we become the "witness" to what is happening, internally (mentally and emotionally) and/or externally in our world.