ConsenSys developed MetaMask in 2016 as a non-custodial cryptocurrency wallet for the Ethereum blockchain. With a user base of 30 million monthly active wallets, It has become the most widely used non-custodial crypto wallet globally.
The user community produced a lot of help content, and now MetaMask have their own Learn section. We advise you to check it out.
MetaMask supports any token on an EVM Chain, including ERC-20 standard tokens and ERC-721 standard NFT’s.
MetaMask is a custodial wallet, you retain exclusive access to your data and accounts, giving you control over what information you keep private or share. It is well programmed to handle private keys. But still, never share your private key.
Apart from a desktop browser version, MetaMask have a mobile smartphone wallet, and a browser plugin.