Public Key

A public address used for receiving and sending cryptocurrency payments. An address contains a mix of numbers and letters (such as bitcoincash:qzmm5ffsl4x29wg50sn7rushcz4gxqpcas5f24432c), where the first section usually give information as to which blockchain it's for (bitcoincash:), or which type of wallet it is. q, 3 etc.

Public keys can be shared without risking the funds and should be the only type of key you reveal or give to anyone.
Although there is no risk to losing funds, if a public key is re-used multiple times they can put the holders privacy at risk. As such, it's a good idea to use wallets which always use new keys.