What is the Windows Registry
The Windows registry is a database which stores settings and options for the operating system for Microsoft Windows 32-bit versions, 64-bit versions and Windows Mobile.
It contains information and settings for all the hardware, software, users, and preferences of the PC. Whenever a user makes changes to “Control Panel” settings, or file associations, system policies, or installed software, the changes are reflected and stored in the registry.
The registry is actually a big file where a lot of setting can be stored.
As the registry is meant to store all the information abut the PC settings it generates a new entry every time you make any changes to the system. That is whenever you install a new program or uninstall an existing program and add or remove any hardware component, the latest information about the settings is logged in the registry file.

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