A differential equation (D.E.) is an equation which involves a function and one or more of its derivatives. It is known as the most important mathematical course for any discipline. It expresses the relationship between the function's values and its rates of change. D.E. have a wide range of applications in various fields such as Physics, engineering, biology, economics. D.E. is also used in motion of any objects, developing video games, physical growth of animals, and also to calculate any rate of change in real life problems. It will be very helpful and easy to understand the course properly if the learners have the fundamental knowledge of calculus.