Simply speaking a class or a method qualified with "abstract" keyword is an abstract class or abstract method. You create an abstract class when you want to manipulate a
set of classes through a common interface. All derived-class methods that match the signature of the base-class declaration will be called using the dynamic binding
mechanism. An abstract method is an incomplete method. It has only a declaration and no method body. Here is the syntax for an abstract method declaration: abstract
void f();

Answers:
Simply speaking a class or a method qualified with "abstract" keyword is an abstract class or abstract method. You create an abstract class when you want to manipulate a
set of classes through a common interface. All derived-class methods that match the signature of the base-class declaration will be called using the dynamic binding
mechanism. An abstract method is an incomplete method. It has only a declaration and no method body. Here is the syntax for an abstract method declaration: abstract
void f();

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