Answer Posted / zafar mohammed ameem

Callbacks are usually the methods which should be invoked
after execution of some method.
Asynchronous Call back is a way of invoking a method
Asynchronously (on a different thread). But before
invocation of method we provide a callback delegate which
refers to the method which should be called after execution
of async method. This method is called call back method.
AsyncCall backs are useful when user intends to execute any
method asynchronously and notify some thing after method is
finshed, without modifying the signature of the method
being called.

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