“Differential Equations (CBCS)” is designed as per the UGC Choice Based Credit System (CBCS) curriculum to meet the requirements of undergraduate students of mathematics and aptly covers Differential Equations and Mathematical Models. Major topics such as Cauchy-Euler, Total and Linear Partial Differential Equations of First Order (Lagrange-Charpit Method) have been dealt with deftly to provide a further insight in the subject. Written in a lucid and concise manner, the textbook has an adept balance between theory with practice.