Design Principles are nothing but a set of thoughts that initiate the basis of any good product. No doubt that they continuously help teams to make decisions in delivering a good quality product. Organizations, individuals and product teams always get benefited from writing and following their design principles. If we talk about OOPs Design Principles, they deal with the principles to design a good quality software where Object Oriented Programming Language is being used for development. In this article, we are going to discuss the most commonly used OOPs Design Principles that are used by Industry Designers & Developers in the real time projects. DRY (Don’t repeat yourself) One of the most important OOPs Design Principles is DRY, as the name suggests DRY