Object-Oriented Programming (OOP) is a programming paradigm characterized by the identification of classes of objects closely associated with the methods (functions) they entail. It is a conceptual framework based on abstract data types, a mathematical discipline for storing data with associated procedures.

The advantages of OOP include its ability to foster code reusability and organizational hierarchy, simplify maintenance, increase productivity, enhance scalability and updates, and lower app development costs.

OOP is applied through languages such as Java, C++, and Ruby. Among its many use cases are client-server systems, real-time system design, office automation systems, and engineering flowcharts and blueprints.