A function can have one or more parameters of different data types, but what if you want to pass a function itself as a parameter? How does C# handle the callback functions or event handler? The answer is – delegate.

A delegate is like a pointer to a function. It is a reference type data type and it holds the reference of a method. All the delegates are implicitly derived from System.Delegate class.

A delegate can be declared using delegate keyword followed by a function signature as shown below.

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