Warm boot refers to restarting a computer that is already turned on via the operating
system. Restarting it returns the computer to its initial state. A warm boot is sometimes necessary when a program encounters an error from which it cannot recover.
On PCs, you can perform a warm boot by pressing the Control, Alt, and Delete keys simultaneously. On Macs, you can perform a warm boot by pressing the Restart button. It is also called a soft boot. Contrast with cold boot, turning a computer on from an off position.
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