"Mindfulness means paying attention in a particular way, on purpose, in the present moment and non-judgmentally." (Jon Kabat-Zinn, PhD, founding Director of the Center for Mindfulness in Medicine, Health Care and Society at the University of Massachusetts Medical School.)
When we focus our minds on the present moment, we are aware of our thoughts, feelings and actions, without attaching judgment to them. It can help us to embrace reality and the present moment, instead of jumping to the past or to the future. There are many different ways to practice mindfulness, including meditation, and it is associated with many benefits.