What are FRAX shares?

Could you elaborate on FRAX shares? I've heard about FRAX as a decentralized stablecoin protocol, but I'm not entirely clear on the role of FRAX shares within this ecosystem. Are they tokens that represent ownership in the FRAX protocol? Do they entitle holders to any specific rights or benefits? And how do FRAX shares relate to the overall stability mechanism of the FRAX stablecoin? Clarifying these points would help me better understand the intricacies of the FRAX ecosystem and its underlying tokenomics.