'Object-Oriented Programming (OOP)' is a programming model centered around 'objects' — data fields (attributes or properties) and procedures (methods). OOP allows an object's methods to access and modify its associated data fields.

Popular OOP languages include Java, C++, C#, Python, and Ruby. OOP divides a program into smaller, modular parts, encapsulating properties and behaviors in objects.

OOP's core concepts include encapsulation (bundling data and methods), abstraction (representing complex real-world scenarios), inheritance (creating new classes from existing ones), and polymorphism (methods and properties taking multiple forms).

OOP is prevalent in software development, valued for handling complex applications, enhancing maintainability, and enabling code reuse. Its approach to modeling real-world scenarios makes it effective for large-scale software systems.