Covered vs uncovered interest rate parity

What’s the difference?

covered interest rate = F uncovered interest rate = E(s)

Covered deals with forward rates and uncovered deals with expected spot rates. Theoretically both should be equal

uncovered is a theoretical relation based on inflation differential. covered is for certain, as locked in with a contract

relative purchasing parity is uses inflation rates to calculate E(s) Uncovered uses interest rates=e(s) Covered uses Interest rate =f