To meditate is to turn inwards, to concentrate on the inner self.
There are many forms of meditation. While the forms of meditation vary, they help us to become a witness of our thoughts.
According to Zen, meditation does not involve any concept but is an awareness of inner silence. As per the Yoga of Patanjali, meditation is a combination of three steps: 1) pratyahara or abstraction, or withdrawal of the mind from the sense-objects, or attention to their memory; 2) dharana or concentration; and 3) dhyana or contemplation which, however, is not a thought-process but an absorption of the feeling of oneness with the ideal.