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Why Dynamic Method Dispatch is called Dynamic Polymorphism?

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Hi guys!
I want to know why Dynamic Method Dispatch is called Dynamic Polymorphism and why overloading is called static polymorphism?
I know both the concepts but why one is static and the other is dynamic?
what i see is it is related to Staic and Dynamic binding which again i din't get.
Static Binding is compile time, the other is run time...I din't get this.

Say class A has display() method, then
A ref1=new A();

why is this static binding? what is dynamic binding then?

Examples please....
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