MetaMask started as a browser extension. Now, it's also a mobile wallet that lets you connect to applications that might have some amount of their logic that lives on a blockchain—and that part of the logic is usually the value-sensitive part. So, it could be like a token or it could be an NFT or it could be your voting rights in an organization. So, MetaMask is the thing that lets a user hold their own keys, which means they're really kind of personally in control of their accounts. And now they're able to engage with these decentralized applications that just weren't even a category 5 years ago.
