Does Uniswap run on Ethereum?

I'm curious about the underlying technology behind Uniswap. Can you tell me if Uniswap runs on the Ethereum blockchain? I've heard that many decentralized exchanges, or DEXs, are built on top of Ethereum due to its smart contract capabilities and robust developer community. If Uniswap is indeed built on Ethereum, can you elaborate on how this affects its functionality and security? I'm particularly interested in understanding how this integration allows for seamless token swaps and how it ensures the safety of users' funds.