Modern Softwares usually consists of millions of lines of code and operates on terabytes of data, and is so complex that not a single person understands it all. Hence we need a way to organize these instructions so that it is: Easier to understand and explain, Easier to reuse and extend, Easier to maintain. And Object-Oriented Programming(OOP) has been one of the most popular paradigms used in the last few decades for this purpose.