Summary

polymorphism means one interface, many forms. A single call can select different implementations. Two main kinds: compile_time_polymorphism and runtime_polymorphism. Compile time uses function_overloading, operator_overloading, and generics/templates. Runtime uses method_overriding, interfaces, and dynamic_dispatch. In a class_hierarchy, a common_interface enables polymorphic_calls. It allows substitution where a base_class_reference points to a derived_instance. Many languages support it with virtual_functions or protocols. Remember: same_message_different_behavior and improved code_reuse, flexibility, extensibility.