A long string of alphanumeric characters that are stored in your wallet and are usually encrypted with a pass phrase. A private key is the equivalent to a password; it is what you use to spend / save your coins.
Each Bitcoin or Satoshi has 1 of more private key. The length of private keys vary depending on the type of cryptocurrency. For example, In Bitcoin, a private key is a 256-bit number. Never share your private key.
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