What's the difference between a variable frequency drive (VFD) and a variable speed drive (VSD)? | Schneider Electric Egypt and North East Africa

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What's the difference between a variable frequency drive (VFD) and a variable speed drive (VSD)?

A Variable Frequency Drive (VFD): is a drive that works on changing the frequency of an AC motor, it always refers and can be used with AC drives only.
A Variable Speed Drive (VSD): is a drive that works on changing the speed of a motor by varying the voltage supplied to it regardless of its type, it always refers to either AC Drives or DC Drives.