Object-Oriented Programming (OOP) has been around for several decades and is still widely used today for many reasons, including:

1. Modularity
2. Abstraction
3. Excapsulation
4. Inheritance
5. Polymorphism
6. Large community & tool support

Overall, the popularity of OOP can be attributed to its ability to promote modularity, encapsulation, abstraction, inheritance, and polymorphism. These features make writing secure, maintainable, and reusable code easier, which can lead to significant cost and time savings in software development projects.

Object-Oriented Programming (OOP) is still widely used because it provides a powerful and flexible way of organizing and structuring code. OOP allows developers to create real-world entities, such as objects and their behaviors, into software components. This approach makes it easier to write reusable and modular code, which can save time and reduce complexity in software development projects.

OOP also provides several benefits, such as encapsulation, inheritance, and polymorphism. Encapsulation ensures that data is protected and inaccessible to unauthorized users. Inheritance allows new classes to be built from existing classes, which can save time and reduce errors. Polymorphism allows objects of different classes to be treated as if they were of the same class, which can simplify code and make it more flexible.

Moreover, OOP languages such as Java, Python, and C++ are well-supported and have large communities of developers who have contributed to their development and evolution. This means that these languages are constantly being updated with new features, libraries, and tools that make OOP development easier, faster, and more efficient.