MetaMask is a web browser extension that also serves as a cryptocurrency wallet. When the browser extension is enabled, web pages can recognize your wallet address and pull up your account immediately if you have shopped with them before.
Your MetaMask holds crypto funds like Ethereum and can also hold your NFTs.
Visit MetaMask.io to install.
You can see more info from MetaMask directly here.
MetaMask is available on your Chrome, Firefox, Edge, or Brave browser.
MetaMask is available on iOS or Android.