Samadhi...

Samādhi is described in different ways within Hinduism such as the state of being aware of one’s existence without thinking, in a state of undifferentiated “beingness" or as an altered state of consciousness that is characterized by bliss (ānanda) and joy (sukha). 


There are a number of recognized named varieties and types of Samadhi. The three primary types are actually levels, states, or stages and usually designated as:Samprajana Samadhi [Access Concentration (upacara samadhi)], Asamprajata Samadhi [Absorption Concentration (appana samadhi)] (also known as Nirvikalpa Samadhi) and Khanika Samadhi [Sequential Momentary Deep Concentration]. Some of the other Samadhis that show up, and sometimes just different names for some of the above and/or varying degrees or cultural or religious designations of each other or the above, are Savitarka Samadhi, Savichara Samadhi and Asmita Samadhi. For example, the two stages of Samadhi found in the yoga philosophy of Patanjali, Samprajnata Samadhi and Asamprajnata Samadhi, are virtually if not totally indistinguishable from Savikalpa Samadhi and Nirvikalpa Samadhi as found in Vedanta. As well, most pundits pretty much agree that the like-level Samadhis Asamprajnata and Nirvikalpa are the same as Nirbija Samadhi.