The classification of the Indian philosophical systems

 The classification of the Indian philosophical systems into heterodox and orthodox schools.

• There are nine Indian Philosophical systems.
• They are classified into two divisions of the orthodox (astika) and the heterodox (nastika).
•  The schools of materialism, Buddhism, and Jainism don’t approve of the authority of the Vedas. 
• They are called heterodox, or nastika. 
• The remaining six schools are all orthodox, because directly or indirectly they accept the authority of the Vedas. 
• They are Nyaya, Vaisesika, Sankhya, Yoga, Mimamsa, and Vedanta schools of philosophy.
•  Of these, Mimamsa and Vedanta schools of philosophy depend on the Vedas and follow Vedic tradition and rituals.
•  On the other hand, Samkhya, Yoga, Nyaya and Vaisesika are not based on the Vedas, but follow Vedic ideas.
•  The materialist school of philosophy accepts four human values such as dharma, artha, kama, and moksha but they don’t accept the ideas of God, soul, akasa. 
• They accept perception as the only means of valid knowledge.
•  This philosophy is also known as Carvaka system or Lokayata philosophy.