A C# delegate is a type that represent the signature of a .NET method. A value of a delegate is effectively a method name. A delegate is similar to a C++ function pointer but it is type-safe. To define a C# delegate, you use the delegate keyword followed by a method signature. This define a type that can reference any method that match the same signature. You can create an instance of a delegate in the same way you create an instance of a type in C#. The value of a delegate is the name of the method you want to reference. It's also important to note that a delegate can point to a instance method. You can use a delegate the same way you call a method. The cool thing is that the method that a delegate reference can change at runtime. If you pass your delegate to a method, that method doesn't know what code is going to run when using the delegate. This is effectively a way to implement polymorphism without creating a hierarchy of classes. This is a more functional and .NET idiomatic way to implement the strategy design pattern.Learn more by watching the video.