Is ArcBlock on Ethereum?

I've been hearing a lot about ArcBlock recently, and as a keen follower of cryptocurrency trends, I'm wondering about its relationship with Ethereum. Could you elaborate on whether ArcBlock is built on Ethereum's blockchain? Are there any shared components or interoperability features? Is there a specific reason why ArcBlock chose this approach, or is it simply a matter of technical alignment? I'm curious to know if there are any limitations or advantages of ArcBlock's potential integration with Ethereum's ecosystem.