Meditation is a practice where an individual uses a technique – such as mindfulness, or focusing their mind on a particular object, thought or activity – to train attention and awareness, and achieve a mentally clear and emotionally calm and stable state. 

Meditation may be used with the aim of reducing stress, anxiety, depression, and pain, and increasing peace, perception, self-concept, and well-being.

Reference :wikipedia, https://en.wikipedia.org/wiki/Meditation , july 4th,2019.