What is dynamic binding?

Answer 1

override is a good example.
A b = new B();
b.doSomething();
if both class have the same method, the compiler only can decide which should call in runtime. Thats the dynamic binding

Answer 2

Perfect example of dynamic binding is overriding. Both parent and child classes have same method.

Answer 3

Dynamic binding it's when type of the object is determined at run-time.
In other words dynamic binding is how polymorphism implemented.

Answer 4

that's dynamic polymorphism not dynamic binding