What is difference between voltage supply and DC voltage supply?

I have been searching for a 4 bit comparator that can operate within the voltage range of 1.8-3.6volts . I got an IC named MC14585B but I am confused in the feature detail provided in datasheet. Can anyone please guide me that does this IC works between 1.8-3.6 voltage supplyhttps://eu.mouser.com/datasheet/2/308/MC14585B-D-96762.pdf

Qurat,The short answer is that this part is not likely to work at less than 3V.
The Maximum ratings table that you show gives the voltages that you can power the part with without damage. This does not mean that the part will work at those voltages.

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Supply voltage and input voltages are two different entity.The supply voltage will always mean the voltage which is available commonly for all appliances, instruments or machines. This is the voltage at which we receive power from the utility i.e. power supplier. Like in Kolkata, CESC supplies all domestic consumers power at 240V and all high tension Industrial consumers at 6kV. So, 240V and 6kV are the supply voltages.The input voltage will mean the voltage which is available at the terminal of any instrument, gadget, machinery, circuit, etc. Like a 415V motor connected through a cable. The supply voltage from the transformer is 415V but because of capacitive voltage drop due to cable, the voltage at the motor terminal may be 410V. Thus the input voltage to the motor will be 410V and supply voltage is 415V.Ekeeda - Instrumentation Engineering Online Courses and Videos