Object-oriented programming language is a programming paradigm that utilizes objects to organize code into reusable and modular structures. There are several synonyms for object-oriented programming language including OOP, object-oriented scripting, object-based programming, and class-based programming. OOP is a popular method in computer programming that has been around for decades, and its use continues to grow due to its usefulness in developing complex software applications. Object-oriented programming languages focus on the importance of objects that are self-contained units of data that perform certain actions when given specific instructions. Developers can use these synonyms interchangeably when discussing programming languages that use object-oriented principles.