Answer / Amit Kumar Arya

Nullable types allow a variable to hold a value of type `null`, in addition to normal values. In C#, value types (like `int` and `bool`) cannot have a null value by default. To create a nullable version of a value type, you can use the `?` symbol followed by the type name (e.g., `int?` or `bool?`). Nullable types are useful when dealing with optional parameters, database values that may be missing, or collections that might not contain any elements.

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