Nyaya Darshana recognizes four Pramanas (means of valid knowledge), which are:
1. Pratyaksha (Perception): Knowledge acquired through direct sensory perception.
2. Anumana (Inference): Knowledge gained through logical reasoning and deduction.
3. Upamana (Comparison): Knowledge derived through analogy or comparison.
4. Shabda (Verbal Testimony): Knowledge obtained through reliable verbal or scriptural testimony.
These Pramanas serve as the basis for epistemology in the Nyaya system of Indian philosophy.