What is the purpose of a pure virtual method and what is its syntactic structure?

A pure virtual method is used to create an interface (abstract class) that defines a behavior contract for derived classes without providing its own implementation. This forces derived classes to override this method.

Syntax structure:

class AbstractClass {
public:
    // Pure virtual method
    virtual void pureVirtualMethod() = 0;
    // ...
};

class DerivedClass : public AbstractClass {
public:
    // Override the pure virtual method
    void pureVirtualMethod() override {
        // Implementation specific to DerivedClass
    }
    // ...
};