A smart contract address is a unique identifier used to refer to a smart contract on the blockchain. A smart contract is a digital code executed on a blockchain platform, and the address is used to identify and interact with it.

The smart contract address typically consists of a long string of characters, including letters and numbers. This address is unique to each smart contract and can be used to send transactions, call functions, and retrieve information about the contract's state.

When you send a transaction to a smart contract address, the blockchain verifies if the transaction meets the conditions described in the smart contract's code and performs the corresponding actions defined in the contract. Thus, the smart contract address is a crucial element for interacting with a smart contract on the blockchain.