What chain does Uniswap support?

I'm curious to know, could you elaborate on which blockchain network does Uniswap primarily operate and support? As a decentralized exchange, it's essential to understand the underlying infrastructure that facilitates its transactions and how that impacts users' experience and security. Could you please clarify which chain Uniswap utilizes to provide its services, and perhaps even touch upon any potential future integrations or partnerships with other blockchain networks?