Introduction to Computer Application is written for the students of B.Com. of all colleges af?liated to universities in Uttar Pradesh, as the state has started implementing the New Education Policy (NEP) 2020 guidelines. The book provides the students not just the knowledge about the fundamentals of a computer system, like its organization, memory management and hardware devices, but also the software that run on it. The book then proceeds to describe various number system and coding schemes, various approaches of programming and types of computer languages, and operating systems along with the techniques. Basic concepts of database and database management package are also provided. Useful application software like MS Word is described in great detail in a separate chapter. The book ends with fundamentals of widely used data communication and network technologies