Power Factor is a description of how efficiently an electric product (specifically an alternating current circuit) uses energy.
Power Factor is presented as percentage. It’s a ratio of the “working power” to “apparent power” which is to say kilowatts (kW) to kilovolt amperes (kVA).
Higher percentages are better, so a 0.90 Power Factor device would be more efficient than a 0.30 one.
Most devices aim for a power factor that is above 0.95 (95% efficiency), but that’s not achievable in all products or circuits