A Wallet Address is a unique string of letters and numbers that represents a wallet, exchange, or blockchain address.
This identifier (unique from every other address on the planet) serves as the virtual street address for the specific currency on that currency’s blockchain.
Addresses are specific to a blockchain and they allow you to transact on that blockchain network, giving you the ability to send and receive a currency to another address on that same network.
Addresses, and the transactions made using that address, can be viewed publicly online, using blockchain explorers, who record all transactions that occur on a blockchain.
While the public can view the transactions themselves, personally identifiable information is not tied to the public data.
This semi-anonymous state is called pseudonymity or being pseudonymous.
Addresses vary in length.
For example, Bitcoin addresses are usually 26-35 characters while Ethereum addresses are 40 characters.