What is THETA fuel?

Could you please elaborate on the concept of THETA fuel in the realm of cryptocurrency? Specifically, how does it function within the THETA network? What role does it play in ensuring the smooth operation of the decentralized video streaming platform? Is it a utility token or does it have a different purpose? Furthermore, how is it acquired and what factors influence its value? I'm interested in understanding the intricacies of THETA fuel and how it contributes to the overall ecosystem.