Wallets are not quite like physical wallets carried around in pockets or handbags. They are repositories where the cryptographic keys associated with the fungible data managed by the ledger are stored. These keys are required to unlock access to the fungible data in the ledger. For example, within the Bitcoin Blockchain, there is an identifier associated with each Bitcoin. To use the Bitcoin, a public and a private key are required. The private keys are stored in the wallet.