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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.
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References in periodicals archive ?
In the first winter after hatching, generally in late summer, these hatchling turtles will hibernate in their natal nest, within 10 centimeters (4 inches) of the surface.
Our evidence suggests that very few Glis hibernate communally in this woodland.
We fatten up during the spring and summer so we can hibernate from September through May.
For example, in much of their geographic range, Little Brown Myotis usually hibernate underground in caves or mines (Fenton and Barclay 1980).
"But if you lose you may as well hibernate. It's a simple as that.
Some mammals will hibernate, with bats looking for warm, dry zones in tunnels or old ice houses, and hedgehogs squirrelling themselves away to survive the months when the insects they eat have either died out or gone into hiding.
Fat-tailed dwarf lemurs, from Madagascar, hibernate for up to seven months of the year to conserve energy during the island's long winter dry season, during which little food and water is available.
For example, honey bees make their nests of wax, while wasps make them of paper, and honey bees do not hibernate, while wasps and bumble bees can hibernate over winter.
Bears hibernate in winter because they can't find enough food.
WHEN the temperature dips, most of us would just love to hibernate. But remember, hibernating is for bears.
Because of Oregon's climate, most bats are beginning to hibernate for winter this time of year, and if they were disturbed while hibernating, they likely won't be able to recover enough stored body fat to last them through the winter, Barnes said.