What is the difference between variable speed drive and variable frequency drive?

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A variable frequency drive (VFD) refers to AC drives only and a variable speed drive (VSD) refers to either AC Drives or DC Drives. VFDs vary the speed of an AC motor by varying the frequency to the motor. VSDs referring to DC motors vary the speed by varying the voltage to the motor.

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Author: http://www.quantum-controls.co.uk/faq/drives/what-are-the-differences-between-a-variable-frequency-drive-vfd-and-a-variable-speed-drive-vsd/