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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 ?
"Up until now there were only three species of primate known to hibernate: all lemurs in Madagascar," says Thomas Ruf of the University of Veterinary Medicine Vienna.
"She is mainly nocturnal and if not caught will probably find somewhere to go and hibernate if the weather becomes severe.
It found that a complex series of changes occur in bears' hearts as they hibernate. These changes guard against complications that could arise from greatly reduced activity.
Northern myotis, Myotis septentrionalis.--Myotis septentrionalis hibernates in caves and is common in Indiana.
Garter snakes hibernate in a squiggly clump in a side room.
AMOST tortoises hibernate around November and will stop eating first.
Madagascan fat-tailed dwarf lemurs hibernate during the winter, even though daily temperatures often top 30[degrees]C (86[degrees]F).
'Bears hibernate for up to seven months,' wrote Bogart the Explorer (@BogartDexplorer).
Many kinds of bears hibernate to save energy during the cold season, when there isn't enough food to eat.
Where winters are milder, some bat species hibernate in hollows in trees.