What network is Scroll on?

Excuse me, could you clarify for me what network Scroll is currently operating on? I've been hearing a lot about this project lately and I'm really interested in diving deeper into its technical underpinnings. I understand that the blockchain ecosystem is vast and diverse, with many different networks and protocols catering to various use cases. So, I'm curious to know if Scroll has chosen a particular network to build upon, and if so, what are the reasons behind that decision? I'd appreciate any insights you could provide on this matter.