What does "80 PLUS certified" mean on a PSU?

What does "80 PLUS certified" mean on a PSU?
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answer:From the 80 PLUS website: The 80 PLUS performance specification requires power supplies in computers and servers to be 80% or greater energy efficient at 20%, 50% and 100% of rated load with a true power factor of 0.9 or greater. This makes an 80 PLUS certified power supply substantially more efficient than typical power supplies and creates a unique market differentiation opportunity for power supply and computer manufacturers.
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