What is the difference between theta and theta Fuel?

THETA is used strictly for staking and securing the network, while TFUEL is used to power microtransactions and operations of the network .

Theta Fuel, as the name suggests, is the fuel of the Theta Blockchain and is thus in part comparable to the “gas” on Ethereum or NEO. TFUEL serves as a means of payment for transactions, such as setting up caching nodes or interacting and creating smart contracts .25 Ara 2020