Explanation: Hindu philosophy is generally classified into six orthodox or classical schools (astika) and three heterodox (nastika) schools.

• The basic difference between these two branches of philosophy schools is based on the recognition of the Vedas: the orthodox schools recognize the authority of the Vedas, while the heterodox schools do not believe in the authority of Vedas.
• Out of these nine systems, eight are atheistic as there is no place for God in them and only the Uttara Mimansa, which is also called Vedanta, has a place for God in it.

Source: Poonam Dahiya