Mnemonic Code (BIP39) Bitcoin, Dash, Ether...
Bitcoin private key either in hex or wif is hard to memory. Mnemonic code overcome this by given better entropy with at least 24 human readable words. This 24 words will then convert into seed for generation of hierarchical deterministic (HD) wallet
Note:
While valid BIP39 mnemonics recovery phrases are derived from this list programatically, that specific process involves generating cryptographically secure random numbers (initial entorpy) as well as the use of converting binary numbers to bytearrays, and applying a cryptographic hash function and thereore must rely on software code. You cannot create a valid mnemonic manually without software. This word list cannot be used - on its own - to generate valid BIP39 mnemonics because the last word must be derived from a checksum that involves a hash function to determine the last groups of bits that must be concatenated to the end the initial string of random bits.