What network is Axelar on?

Could you please elaborate on the network infrastructure that Axelar operates on? Given its focus on enabling cross-chain communication and interoperability, I'm curious to know if Axelar is built on an existing blockchain platform, a bespoke network, or if it utilizes a hybrid approach that incorporates multiple technologies. Understanding the underlying network structure will help me grasp the scope and capabilities of the Axelar project.