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The keyword that is used to get the default value of a generic type in C# is "default." When you use the "default" keyword with a generic type parameter, it returns the default value for that type, which is dependent on its data type.

For example, if you use "default(T)" where T is a reference type, it returns null, and if T is a value type, it returns the default value for that particular value type (like 0 for integers or false for booleans). This feature is especially useful when working with generic methods or classes, allowing for cleaner and more efficient code without the need to explicitly define the default value for each potential type.

In summary, the "default" keyword efficiently provides the appropriate default value for any given generic type, making it essential for generics in C#.