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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 ?
One impressive hibernator is the western conifer seed bug, only recently appearing in eastern North America.
Skunks are not true hibernators, but the females sleep for weeks at a time in winter, living off their body fat.
The new battlefield resuscitation strategy is about slowing biological time, an idea that was borrowed from the "tricks" of natural hibernators, and is based on Professor Dobson's prior research innovation, Adenocaine([R]) technology, which is now used in the USA in cardiac surgery, and soon to be introduced in Europe and other international markets.
The bears' cholesterol-defying arteries are just one of the evolutionary tricks allowing hibernators to spend six months as furry couch potatoes without negative side effects.
The American Physiological Society has called hibernators such as marmots, bears, woodchucks, hedgehogs and lemurs "medical marvels" because they can turn off their appetites and slow their breathing to a point that would be lethal to other animals.
Mice are not hibernators, unlike their cousins the Meadow Jumping mice, and tunnel under the snow during the winter months.
Only 35% declared themselves hibernators, who would stay in bed and wait for the bug to pass.
It may seem inexplicable to those who perpetually mourn the passing of summer, but home hibernators love the chill in the air, darker nights and relish being able to retreat indoors.
True hibernators, bats lower their temperatures and sleep with a heart rate just above death.
For all winter hibernators, here's a pleasant walk to gently get your legs back into action again
Hibernators spend most of the winter in torpor, a state of self-induced reduction in body temperature and metabolic rate.
I tend to leave hollow stemmed herbaceous growth for insects and layers of leaves at the backs of beds for other hibernators.