MetaMask is a self-custody wallet that connects you to Ethereum and other supported blockchain networks from your browser.
Think of it as a keyring and a connection point. It can help you manage digital assets, approve transactions, and connect to decentralized applications—often called dapps—without handing your wallet keys to a central service. The Chrome extension lives in your browser toolbar, ready when a website asks to connect.
That convenience comes with responsibility. Unlike a traditional account, self-custody means you control the recovery phrase and are responsible for keeping it private. There is no customer-service desk that can restore a phrase you lose. Understanding this trade-off is the most useful first step.
The extension is a doorway, not the destination. It can help a browser-based application request a connection, but the application itself remains a separate service. A connection can make your public address visible to a site; approving a transaction is a separate action. Get comfortable distinguishing those moments before you use a wallet with meaningful funds.
Blockchain networks also differ in fees, supported tokens, and transaction behavior. Make sure you're on the network you intend to use, and don't assume that an asset or application is available everywhere. A little preparation—especially learning to identify the official site and reading prompts slowly—can prevent avoidable mistakes.