LED power supply sources that provide a "constant-current LED power supply" output have typically been referred to as LED drivers. In the past, AC-DC power supplies that provided a regulated “constant-voltage” to LEDs were referred to as LED power supplies.Today, the terms "LED driver" and "LED power supply" are used interchangeably.
Also, it depends on the type of LED. A bare LED (or series string of LEDs) needs current limiting, so a constant current supply may be used. They can also work with a constant voltage supply if a current limiting resistor is used.
Some LED bulbs and tapes have built-in current limiting resistors and can operate on any 12VDC supply as long as the current rating is sufficient.
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