Attention, emotion regulation—even love—are skills that can be trained through the practice of meditation.
Mindfulness is a state of active, open attention on the present. When you're mindful, you carefully observe your thoughts and feelings without judging them good or bad. Instead of letting your life pass you by, mindfulness means living in the moment and awakening to your current experience, rather than dwelling on the past or anticipating the future.
Stress generally refers to two things: the psychological perception of pressure, on the one hand, and the body's response to it, on the other, which involves multiple systems, from metabolism to muscles to memory.