Windows 10 LTSB vs Windows 10 LTSB Features on Demand

[MSCom]

Dear community,

as a business costumer we have volume-licensing and we found the LTSB version of Windows 10, which we are very happy about.
Yet we don't understand the difference between:
- Windows 10 LTSB and
- Windows 10 LTSB Features on Demand

could someone tell me what the [Windows 10 LTSB Features on Demand] has more or less that the normal LTSB Version ?

Thanks a lot