user57716: recently i played with the tool generation of HD address on https://iancoleman.github.io/bip39/. after input mnemonic code and check the derivation path, why is there Account Extended Public Key & BIP32 Extended Public Key? What's the difference between 2? Can i use Account xpubkey to generate the same address as bip32 xpubkey? 
please advice, 

user51948: BIP 44 just specifies a structure for organising keys using BIP 32 style generation. The tree structure is this:
 m / purpose' / coin_type' / account' / change / address_index

Generally, m refers to your BIP 32 master private key generated from the mnemonic in BIP 39. But all children extended keys are also extended parents if you want them to be - all can have children. So Account extended public key will just be the extended public key generated as a child of the coin_type extended key from the hierarchy above.

57716: <p>recently i played with the tool generation of HD address on <a href="https://iancoleman.github.io/bip39/" rel="nofollow noreferrer">https://iancoleman.github.io/bip39/</a>. after input mnemonic code and check the derivation path, why is there Account Extended Public Key &amp; BIP32 Extended Public Key? What's the difference between 2? Can i use Account xpubkey to generate the same address as bip32 xpubkey? </p>

<p>please advice, </p>
 51948: <p>BIP 44 just specifies a structure for organising keys using BIP 32 style generation. The tree structure is this:</p>

<pre><code> m / purpose' / coin_type' / account' / change / address_index
</code></pre>

<p>Generally, <code>m</code> refers to your BIP 32 master private key generated from the mnemonic in BIP 39. But all children extended keys are also extended parents if you want them to be - all can have children. So Account extended public key will just be the extended public key generated as a child of the coin_type extended key from the hierarchy above.</p>
