Maraṇasati is a Buddhist meditation practice of remembering that death can strike at anytime, and we should practice assiduously appamada and with urgency in every moment, even in the time it takes to draw one breath. Not being diligent every moment, is called negligence by the Buddha. In the Earliest discourses of the Buddha, the term Maranasati is only explicitly defined twice, in those two suttas AN 6.19 and AN 6.20.
Mindfulness is the practice of purposely bringing one's attention in the present moment without evaluation, a skill one develops through meditation or other training.
Mindfulness derives from sati, a significant element of Buddhist traditions, and is based on Zen, Vipassanā, and Tibetan meditation techniques.
Though definitions and techniques of mindfulness are wide-ranging, Buddhist traditions explain what constitutes mindfulness such as how past, present and future moments arise and cease as momentary sense impressions and .