Is GRT an Ethereum?

Could you please clarify for me whether GRT is indeed an Ethereum? I've heard some discussions about it being associated with the Ethereum blockchain, but I'm not entirely sure. Could you provide more insight into this matter? If it's not an Ethereum, what exactly is GRT, and how does it operate within the cryptocurrency and finance industry? I'm quite interested in understanding its functionalities and potential impacts on the market. Thank you for your assistance in clarifying this matter for me.