samadhi (Sanskrit: "standing within one's Self; sameness; contemplation; union, wholeness; completion, accomplishment.") which represents "super consciousness"; "complete absorption into the absolute", "Universal Consciousness" — is the state of true yoga, in which the meditator and the object of meditation are one.
The separation of manas (mind) from the body, and its union with the paramatma (Universal Consciousness, Godhead); the complete “forgetting” of the “small self” (Jivatman) and mergence with the unchanging “Higher Self” (paramatma). The eighth of Patanjali’s Ashtanga Yoga (“eight limbs of Yoga”).
Samadhi is of two levels. The first is savikalpa samadhi ("enstasy with form or seed"), identification or oneness with the essence of an object. Its highest form is the realization of the primal substratum or pure consciousness, satchidananda. The second is nirvikalpa samadhi ("enstasy without form or seed"), identification with the Self, in which all modes of consciousness are transcended and Absolute Reality, Brahman, beyond time, form and space, is experienced. This brings in its aftermath a complete transformation of consciousness. In Classical Yoga, nirvikalpa samadhi is known as asamprajnata samadhi, "supraconscious enstasy" — samadhi, or beingness, without thought or cognition, prajna. Savikalpa samadhi is also called samprajnata samadhi, "conscious enstasy."
When we succeed in becoming so absorbed in something that our mind becomes completely one with it, we are in a state of samadhi. Samadhi means "to bring together, to merge". In samadhi our personal identities completely disappear. At the moment of samadhi none of that exists anymore. We become one with the Divine Entity.
During samadhi, we realize what it is to be an identity without differences, and how a liberated soul enjoys a pure awareness of this pure identity. The conscious mind drops back into that unconscious oblivion from which it first emerged. The final stage terminates at the instant the soul is freed. The absolute and eternal freedom of an isolated soul is beyond all stages and beyond all time and place. Once freed, it does not return to bondage.
The perfection of samadhi embraces and glorifies all aspects of the self by subjecting them to the light of understanding. The person capable of samadhi retains his/her individuality and person, but is free of the emotional attachment to it.