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A glitch, in technical terms, refers to a small and fleeting error in a system that occurs due to unknown causes. While the actual cause of a glitch is unknown, it can potentially cause serious harm to the system, including power failure, temporary loss of service or data loss.
In the event of a glitch, the system experiences a temporary failure. In networks, a glitch can cause loss of data or service and short-lived failure in the case of a power system. Glitches are not only common in electrical and electronic systems where hardware is involved; software also experiences glitches, that are commonly known as bugs. Software bugs often go away once the program is restarted because it eliminates the conditions that caused the glitch. However, sometimes restarting the program is not enough and systems needs to be rebooted in order to get rid of a system glitch.