Description: A virtual method is a fundamental concept in object-oriented programming that allows a method defined in a base class to be overridden in a derived class. This means that although the method is declared in the base class, its implementation can be modified in the classes that inherit from it. This feature is essential for achieving polymorphism, which allows a single method call to have different behaviors depending on the object invoking it. In languages like C# and Java, virtual methods are declared using keywords that indicate that the method can be overridden, such as ‘virtual’ in C# and ‘override’ in Java. This ability to override methods enables developers to create more flexible and reusable class hierarchies, facilitating the implementation of design patterns and the creation of more robust and maintainable applications. Additionally, the use of virtual methods promotes separation of concerns and encapsulation, two key principles of object-oriented programming.