What Is the MetaMask Extension?
MetaMask is a browser extension wallet for Ethereum and other EVM-compatible networks. It holds your keys, signs transactions, and lets websites talk to blockchain apps without a central account.
A self-custody wallet in your browser
The extension stores your private keys encrypted on your device, so no company holds your funds on your behalf. That design gives you control, and it also means you are responsible for your backup.
How it connects to websites
When a decentralized app asks to connect, MetaMask shows a prompt. You choose which account and network to share, and every transaction or signature waits for your approval before anything is sent.
Who it is for
Developers testing smart contracts, people using decentralized finance, NFT collectors, and anyone who wants a wallet inside the browser they already use. Beginners should start with a small amount until they are comfortable with approvals and fees.