A unique alphanumeric address representing a "wallet" on a blockchain that can be used to send and receive cryptocurrency.
A blockchain address is an alphanumeric string that identifies a specific wallet on a particular blockchain, which can be used to perform transactions. Cryptocurrency addresses are unique and trackable and their inflows and outflows can be observed on-chain.
While most blockchain addresses are anonymous, since there is no compulsion to connect them with real-world identification, some cryptocurrency holders choose to link themselves to their wallets, such as Vitalik Buterin, one of the founders of the Ethereum network.