Wallets/metamask

I created a eth classic wallet and I’m confused on how metamask is managing my account. It shows me my public address and i have been able to eth to and from it. But I’m confused is metamask a new wallet from my eth or is it just a managing app?

MetaMask is a bridge that allows you to visit the distributed web of tomorrow in your browser today. It allows you to run Ethereum dApps right in your browser without running a full Ethereum node.
MetaMask includes a secure identity vault, providing a user interface to manage your identities on different sites and sign blockchain transactions.

from https://metamask.io/