Partial differential equations are extensively used in science and engineering due to their vast applications. Also, it is included in syllabi of mathematics at graduate and post graduate level i.e. B.Sc., M.Sc., B.Tech., B.Pharma., M.Tech., M.Pharma., M.Phil. etc. New books on the old subjects like "Partial Differential Equation" is always become the matter of criticism. Book emphasizes the need of understanding the typical concepts of Wave, Heat and Laplace Equations as relevant to student learning. Each chapter has been divided into topics which include precise theories and solutions of practical problems. It is presupposed that the readers are used to with partial differentiation of a function & ordinary partial differential equations.