<b><a href="https://sites.google.com/metamaskius.com/metamask-portfolio/home">MetaMask</a></b> serves as a digital wallet, allowing users to store and manage their Ethereum-based cryptocurrencies (such as Ether) and tokens.Users can switch between different Ethereum networks, such as the mainnet, testnets, and custom networks, to test and deploy smart contracts.MetaMask allows users to send and receive Ethereum and ERC-20 tokens. Users can also customize gas fees when making transactions