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HD Wallets – Difference between root_xprivate_key and xprivate_key

I was using Python-hdwallet for the implementation of a hierarchical deterministic wallet. My question is, what is the difference between root_xprivate_key and xprivate_key OR root_xpublic_key and xpublic_key ? { "cryptocurrency": "Bitcoin", "symbol": "BTC", "network": "mainnet", "strength": 160, "entropy": "c5b0d0ee698f3f72b6265f1bc591f8f2d7afa6dd", "mnemonic": "주일 액수 명단 천둥 해수욕장 전망 추천 직업 그룹 단위 신체 파란색 시청 천천히 스트레스",::Listen

I was using Python-hdwallet for the implementation of a hierarchical deterministic wallet.

My question is, what is the difference between root_xprivate_key and xprivate_key OR root_xpublic_key and xpublic_key ?

{     "cryptocurrency": "Bitcoin",     "symbol": "BTC",     "network": "mainnet",     "strength": 160,     "entropy": "c5b0d0ee698f3f72b6265f1bc591f8f2d7afa6dd",     "mnemonic": "주일 액수 명단 천둥 해수욕장 전망 추천 직업 그룹 단위 신체 파란색 시청 천천히 스트레스",     "language": "korean",     "passphrase": null,     "seed": "5a9b9667ccd07b3c641b1ba95e9119dd1d5a3034fd46cd2f27fc1f160c7dcd824fc0ab4710a9ae90582dffc3b0803bcbc0a8160feeaab4c70511c5035859decf",     "root_xprivate_key": "xprv9s21ZrQH143K2qMHU8aghJ4MoQR5g5mowXbeP2vCP937bseZGX929dmJudL7u4xRxtKvh58pxz1PhtCbWW2yUH14jdduKVMV9FkBMpM2Hyw",     "root_xpublic_key": "xpub661MyMwAqRbcFKRkaA7h4S16MSFa5YVfJkXFBRKowUa6Ufyhp4TGhS5nkvkLXSmdNjoszzDkU26WW2rg1zBsQBt6Pv3T8oLEAExGHD3hcQs",     "xprivate_key": "xprvA2YyMZWyPK2xo4eZgyypp2CzcHnxNzGbruGg7vmgaAVCtBtrjwzuhXJBNM3FrwBh85ajxHErNR6ByN77WJARpC1HDC7kTwa2yr7Mu9Pz5Qq",     "xpublic_key": "xpub6FYKm53sDgbG1Yj2o1WqBA9jAKdSnSzTE8CGvKBJ8W2BkzE1HVKAFKcfDcCHKpL5BQRg2HjbNSt55jpFshY7W1KFtp7zjB3DhNAmiFv6kzB",     "uncompressed": "081016370b45d7e23bd89b07d6886036f5e4df9a129eee3b488c177ba7881856e24d337b280f9d32539a22445e567543b39b708edf5289442f36dcde958a3433",     "compressed": "03081016370b45d7e23bd89b07d6886036f5e4df9a129eee3b488c177ba7881856",     "chain_code": "cf9ee427ed8073e009a5743056e8cf19167f67ca5082c2c6635b391e9a4e0b0d",     "private_key": "f79495fda777197ce73551bcd8e162ceca19167575760d3cc2bced4bf2a213dc",     "public_key": "03081016370b45d7e23bd89b07d6886036f5e4df9a129eee3b488c177ba7881856",     "wif": "L5WyVfBu8Sz3iGZtrwJVSP2wDJmu7HThGd1EGekFBnviWgzLXpJd",     "finger_print": "ac13e305",     "semantic": "p2pkh",     "path": "m/44'/0'/0'/0/0",     "hash": "ac13e305a88bd9968f1c058fcf5d9a6b1b9ef484",     "addresses": {         "p2pkh": "1Ggs3kkNrPPWoW17iDFQWgMdw3CD8BzBiv",         "p2sh": "3GQVUFePz517Hf61Vsa9H2tHj5jw5y6ngV",         "p2wpkh": "bc1q4sf7xpdg30vedrcuqk8u7hv6dvdeaayy3uw5cj",         "p2wpkh_in_p2sh": "3JyV5aSgdVYEjQodPWHfvehQ5227EDr3sN",         "p2wsh": "bc1qnk0s9q4379n6v9vg0lnhdu5qhjyx99u2xm238pmckmjg9v29q54saddzp9",         "p2wsh_in_p2sh": "3MmsEoP7GLHzuLVgkAtcRtyXLTWh8zNAcd"     } }