What do we mean when say "iSCSI" boot without HDD needed?

What do we mean when say "iSCSI" boot without HDD needed?

https://technet.microsoft.com/en-us/library/ee619722%28v=ws.10%29.aspx
Microsoft Internet SCSI (iSCSI) Boot enables you to start Windows Server®-based computers by using a network adapter or an iSCSI host bus adapter (HBA) as an alternative method of accessing block-level storage to local storage. This can help save both power consumption and heat generated by eliminating the need for local storage on each server or blade server.
Lonelygirl_2012Asked:
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Joseph DalyCommented:
They are basically talking about a boot from SAN setup. You can have servers that have no internal HDDs but rather boot using an iscsi target and load the OS from you SAN
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