What is polymorphism in object-oriented programming?

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Polymorphism in object-oriented programming refers to the ability of different objects to be treated as instances of the same class through a common interface. It primarily enables objects to take on multiple forms and allows methods to operate on objects of various types.

This capability is achieved mainly through two approaches: method overriding and method overloading. With method overriding, a subclass can provide a specific implementation of a method that is already defined in its superclass, allowing it to behave differently when called on objects of the subclass. Method overloading, on the other hand, allows multiple methods in the same scope to have the same name but different parameters, enabling objects of different types to invoke methods of the same name in a manner suited to their particular type.

The other options do not accurately represent the concept of polymorphism. Memory management involves how programs handle allocation and deallocation of memory resources, which is unrelated to the idea of multiple forms. Variable declaration pertains to stating the type and name of a variable in programming, while the creation of new classes refers to class inheritance or the instantiation process, rather than the behavioral flexibility characteristic of polymorphism.