What is difference between constitutional, statutory, extra constitutional, non constitutional bodies?

Constitutional Bodies:

• Framed by (and mentioned) Constitution
• Can not be abolished without consent of the states
• Helps in performing specific functions or duties
• Can be of both permanent or non-permanent type
• Example: Election Commission of India, Union Public Service Commission (UPSC), Finance Commission etc

Statutory Bodies:

• Set up by law which is authorized to enforce legislation on behalf of the relevant country or state
• Mostly found in parliamentary type of government
• Is not defined in the constitution
• Example: National Human Rights Commission, National Commission for Women etc.

Extra Constitutional:

• Established by a resolution (decision) of union cabinet
• Not defined in Constitution of India

Non constitutional:

• Not found in constitution of a country.
• Statutory body can also be called as a non-constitutional body
• Example: NDC, NHRC, CIC etc.