Dhyana literarily means worship or religious meditation. It is the culmination of an undisturbed concentration in Ashtanga Yoga. It is a stage in which the mind survives in the present, in a state of sureness in which there is no uncertainty.
[tag]Dhyana[/tag] involves focusing on a particular point with the intention of knowing the fact about it. Dhyana or meditation is the study of deep calmness, tranquility and [tag]concentration of mind[/tag]. In short, it is the way to attain complete control over the mind. Through meditation the states of consciousness, sub-consciousness and unconsciousness is taken to the stage of super consciousness.
In the fundamental stage of meditation one should decide on the target for concentration. The target could be anything which provides serenity and tranquility to the mind and should be something on which the mind can concentrate on. The concentration is done with the help of sensory organs. This actually means that the individual can look at the target, recite a small mantra or chanting which he simultaneously keeps listening without being able to think about anything else other than the target.
During meditation the mind can distinguish between the different objects, the subtle layers of covering that covers the intuition. To put it in a simple manner, the mind can now differentiate between the mind of perceiver, the way of perception, the things that are being perceived, the difference between the meanings, words, ideas and evolution of nature. Both the subject and object should be thoroughly grasped in order to known their apparent difference. Thus Dhyana is the understanding of the real identity from apparent differences.