MetaMask (often affectionately called "the little fox" by users) is the world's most popular non-custodial cryptocurrency wallet and the core gateway tool connecting users to the Web3.0 world. Initially launched in 2016 as a browser extension to lower the barrier to entry for Ethereum, it has now evolved into a multi-platform infrastructure supporting iOS, Android mobile devices, and all major browsers.

As a self-custodial wallet, MetaMask's core philosophy is "sovereignty in the people." Unlike banks or centralized exchanges, MetaMask does not store users' private keys or seed phrases; these critical pieces of information are entirely encrypted and saved locally by the user. This means users have absolute control over their assets, but also bear the security responsibility of safeguarding their own keys. It serves as the "digital identity" for entering DeFi, NFT markets, and various decentralized applications (dApps). Users only need to sign and authorize through MetaMask to complete cross-platform asset operations and interactions.