Yoga is a Spiritual discipline for conditioning the Body and
Mind to elevate the Spirit. Concentration and meditation will lead
to Samadhi or Super-conscious experience. It has several stages of
ascent, which are deliberation [Vitarka], analysis [Vichara],
joy [Anandha], and self-awareness [Asmita].
Ultimately, the Yogi is freed from births and deaths and he attains
Supreme Independence, Kaivalya or final liberation.
However, some Siddhis or supernormal powers manifest as Yogic practice
advances. The Yogi should shun away from these and march forward to
his goal of Nirvikalpa Samadhi or the final liberation.
may ask, if for true Spiritual Realization, is Raja yoga with meditation
and concentration the only available path. It is not absolutely necessary.
In karma yoga whether we do the Vedic rituals or service to others
and in bhakti yoga when we do a prayer service and worship God in
the several forms, if we concentrate and do our service well without
looking for the outcome or fruits, that is like meditation and that
will lead to the real Samadhi also.
the whole of the mind has become one wave and one-pointed and concentrate
on one-form, it is called Samadhi. If the mind can be fixed on the
center for short periods of time it will be a Dharana. When we are
able to successfully concentrate for longer time it will be a Dhyana
or meditation. When we ultimately control the mind by prolonged Dhyana
it will be a Samadhi.
is Concentration of the Mind leading to a Super-conscious State. Samadhi
is a state of evenness of the mind with a clear vision of the Truth
and a state that is ready to receive the true wisdom or Jnaana. Meditation
removes obstacles in Sadhana and helps to attain Samadhi. Avidya (ignorance),
Asmita (egoism), Raga-Dvesha (likes and dislikes), Abhinivesha (clinging
to mundane life) are the five Kleshas or afflictions.
we destroy these we will attain Samadhi. Samadhi is of two kinds:
 Savikalpa, Samprajnata or Sabija; and  Nirvikalpa, Asamprajnata
or Nirbija. In Savikalpa or Sabija, there is Triputi or the triad
(knower, known and knowledge). In Nirvikalpa Samadhi, (also called
Nirbija Samadhi or Asamprajnata Samadhi) there is no triad. Sage Patañjali
says that with Dhyana and Samadhi the soul reaches its end in liberation
and enlightenment referred to as Kaivalya which is the ultimate goal
of yoga, and it means solitariness or detachment.