Meditation can be defined as techniques to focus attention and self-awareness. Meditation is also a consciousness-changing technique that has been shown to have a wide number of benefits on psychological well-being. It creates changes in the brain that have multiple health benefits. - both physiological and psychological - BODY and MIND.

You may think of meditation as a very silent and still practice, but you can achieve meditative states doing a variety of activities. Meditation practices activate Alpha and Theta waves while calming/slowing the Beta waves. Alpha and Theta waves are responsible for increased learning and overall mental wellbeing. Alpha waves calm the nervous system. *Beta waves are responsible for conscious thought and logical thinking. Delta waves are active during deep and restorative sleep.
Mindfulness Meditation
Developing a “mindfulness” mindset takes practice and self-awareness. As you go about a task, notice how your body is present in the task, use your senses to feel, smell, listen, and see. Remove judgment of what you perceive - for example, if the air is cool, just notice the coolness vs. rejecting it or assigning negative emotion to it. 
7 attributes to an attitude and approach to mindfulness: 
Non-judging, patience, beginner's mind, trust, non-striving, acceptance, letting go, gratitude and generosity.