- Constitutional bodies are those mentioned in the Constitution of India (e.g., Election Commission, UPSC, State Finance Commission, NCBC, etc.). - Statutory bodies are those created by an Act passed by Parliament or a State Legislature (e.g., NHRC, CIC, SEBI, etc.). - Executive bodies (or non-constitutional, non-statutory bodies) are created by an executive resolution of the government (e.g., NITI Aayog).