Public Address is a string of alphanumeric characters that are uniquely tied to a specific private address. Similar to an email address to send/receive emails, the public address is used to send/receive cryptocurrencies.
This is very similar to an email address except instead of using it to send/receive emails, it is used to send/receive crypto currencies. The name public comes from the fact that these addresses appear on the block explorer when searched, and the sender needs to know the public address of the receiver to send crypto currencies to their wallet.
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