Both are units of power , kW is active power whereas kVA is the apparent power because only a certain portion of the available kVA can be utilized kVA=kW+kVAR. If you take a mug of coffee, you can see its two component coffee+ foam. Here the portion of coffee is active power(kW), foam is reactive power caused by certain electrical equipment, and coffee + foam is apparent power (kVA).
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