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Object-oriented programming (OOP) is a programming paradigm that uses "objects" to design applications and software. These objects are instances of classes, which are essentially user-defined data types that encapsulate data and functions that operate on that data into a single unit. The concepts of encapsulation, inheritance, and polymorphism are central to OOP. Encapsulation allows for the hiding of implementation details, making code more modular and easier to understand. Inheritance allows for code reuse by allowing a class to inherit properties and methods from another class. Polymorphism allows objects of different classes to be treated as if they were objects of a common superclass, enabling the creation of more flexible and reusable code. OOP is a powerful tool for organizing and structuring complex software systems, making it an ideal choice for software development and design within the programming paradigms category.