USD Coin, more popularly known as USDC, is an ERC-20 stablecoin that is pegged 1:1 to the US dollar. Each USDC created is backed by $1 in a regularly audited bank account by a consortium called Centre.
Due to its nature of having dollar reserves, dollar stablecoins like USDC is the closest equivalent to a USD currency in the Ethereum blockchain! As long as you have an ETH Receiving Address activated, you may start trading with USDC!
For more information on USDC and its dollar reserves, you may check this link.