http://walletdvl5avrmoxk2fwsf5b76zkmbkoo3r6kqeesq5hsgnq7xhbciad.onion/what-is-wif
Abbreviation of Wallet Import Format (WIF, also known as Wallet Export Format) is a way of encoding a private ECDSA key so as to make it easier to copy. A private key is a secret code that allows bitcoins to be spent. In order to make copying of private keys less prone to error, Wallet Import Format may be utilized.