it acts as a wallet, replacement to metamask and other apps developers may use, but provides additional functionality, most of which is useful for development, and potentially also for providing better security and UX for power users (e.g.: ability to simulate transactions locally and inspect for unwanted side effects)

it enables web3 developers, particularly frontend devs, to replace a set of multiple tools (wallet + tenderly + impersonator + etherscan) when developing contracts, either locally with anvil, or in livenets