OPP most likely refers to Object-Oriented Programming. Object-oriented programming (OOP) is a programming paradigm based on the concept of "objects", which can contain data, in the form of fields (often known as attributes or properties), and code, in the form of procedures (often known as methods). A feature of objects is that an object's procedures can access and often modify the data fields of the object with which they are associated (objects have a notion of "this" or "self"). OOP languages include Java, C++, C#, Python, and many others. It's used to create modular, reusable, and maintainable code.
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