The global assembly cache (GAC) is a machine-wide code cache that stores assemblies specifically designated to be shared by several applications on the computer.

The Global Assembly Cache in the .NET framework provides a central place for registering assemblies. These assemblies once registered are then available to all applications for usage.

Global assembly cache is nothing but a special disk folder where all the shared assemblies will be kept. It is located under <drive>:\WinNT\Assembly folder.

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