What is "instant-off"

Instant-off is a feature found in modern laptops, predominantly included in premium, high-end models only. Instant-off enables users of such devices to immediately power down their hardware without enduring the long and often arduous waiting process typically associated with laptops that are not Instant-off enabled. Whilst such a feature could technically be incorporated into inferior mainstream consumer models, the high cost and low level of user education associated with this market are prohibitive.