Wikipedia
Yoga-darsana
According to the Hindu philosophy, there are six darshans (the ways of seeing the world): Purva Mimansa, Uttara Mimansa (Vedanta), Nyaya, Vaisheshika, Sankhya, and Yoga. Yoga-darsana is based on the exposition of the epistemological, metaphysical, and methodological ideas of an age-long meditative tradition codified in the work of Patanjali and widely known as Yoga Sutras.
Yoga-darsana is concerned primarily with acquisition and perpetuation of two states of mind referred to as "collocative" (sapaksa) with Yoga, namely, the state of the onepointed mind ( ekāgratā) and the state of the inhibited mental functions (niruddha). The Yoga itself is being equated with samādhi.