The yogic tradition has described three aspects of awareness through meditation:
Concentration is focus of the mind, the ability to hold the awareness of your mind on one point, one place, without wavering. The perfection of concentration leads to meditation. In the state of concentration, your mind is not aware of the external environment or of other peripheral things that surround the object of concentration ie. the object you are focusing on.
Trataka is one of the most direct, simple and effective techniques for attaining concentration of mind. It can be practiced by everyone and its benefits are enormous. The word trataka means ‘steady gazing’. The practice of trataka involves gazing at a point or object without winking or blinking the eyes. It is a method of focusing the eyes, and in turn the mind, on one point and forgetting everything else. The object can be either external, in which case the practice is called bahir trataka (outer gazing) or internal, in which case the practice is called antar trataka (inner gazing).