Windows registry is a file that is used to store information and settings for all the hardware, operating system and other software, user accounts, system settings, and preferences.
Whenever you start the computer the system reads the values from the registry entries to initialize the components that are essential for system to run smoothly.
Whenever any change is made to the system settings or a program is installed or uninstalled, a new entry is generated in the registry. In this way, with continuous use the registry gets piled up with data most which is not used by the system.
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