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A power-off mode that preserves the last state of the computer. Turning the computer on after hibernating eliminates booting the operating system and reloading all the applications and data.

When hibernate is activated, the contents of memory (RAM) are written to storage (hard disk, SSD) and the computer is turned off. When turned back on again, the previous memory state is read from storage, and all applications appear exactly as they did the moment hibernate was triggered.

Hibernate Vs. Sleep Mode
Hibernate is power off, whereas sleep mode is power on with the screen and hard disks turned off. In sleep mode, the RAM chips are constantly refreshed in order to retain their content, and the CPU is placed into a low-power state. Although restoring from hibernate is faster than a cold start, coming out of sleep is immediate. Turning the computer back on from either mode eliminates having to reload all applications and data.

Hybrid Modes
Some laptop computers invoke both modes automatically. When put into sleep mode by the user, the computer may automatically go into hibernate mode when the battery reaches a low level. An alternative hybrid mode activates hibernate when the computer enters sleep mode, but the computer is not turned off. If the battery runs out while in sleep mode, the contents of memory have already been saved. See memory.
References in periodicals archive ?
In the spring the dry leaves can then be added to the compost heap and the ladybirds and other hibernating insects can escape.
The fungus may interrupt bat sleep patterns and causes the hibernating bats to awaken, depleting their fat reserves and causing starvation.
While hibernating bears can also survive for seven months or more without excreting their urinary wastes, humans would die from the buildup of these toxic substances after only a few days.
Which of the following is NOT true about hibernating bears?
Systematic counts of hibernating bats have been carried out at these sites since the late 1970s.
Like most hibernating animals they may become active during warmer spells of weather, and in very mild winters may not hibernate properly at all.
Researchers are learning that hibernating bears aren't necessarily caving in to the winter do-nothings.
Nevertheless, since areas of hibernating myocardium exist side-by-side with normal heart muscle, the disparity in electrical activity can result in rhythmic chaos, making the heart vulnerable to fatal arrhythmias.
The most abundant bat at Wyandotte Cave is the Indiana myotis, Myotis sodalis, and the numbers of bats of that species hibernating in the cave have been increasing steadily over the last two decades.
Silver-haired bats were discovered hibernating in hulls of ships, and numbers of them found various refuges on ships and yachts in New York (15).
One such tragedy occurred in 2000, when some Tennessee teenagers entered Wolf River Cave and attacked a hibernating colony of 2,400 bats.