The Nyaya Darshana system identifies four Pramanas (valid means of knowledge):
1. Pratyaksha (Perception): Direct sensory knowledge.
2. Anumana (Inference): Knowledge from logical reasoning and deduction.
3. Upamana (Comparison): Knowledge via analogy or comparison.
4. Shabda (Verbal Testimony): Knowledge from reliable verbal or scriptural accounts.
These Pramanas establish the epistemological framework for the Nyaya system of Indian philosophy.