Information systems are a set of systems that can process and organize large amounts of data and information. This book on information systems discusses the distribution and collection of data in all stages and its process in the business sector. This book studies, analyses and upholds the pillars of information systems and its utmost significance in modern times. Contents in this book highlight the importance of accurate data distribution and data retrieval as a method to reduce the margin of error. It is a complete source of knowledge on the present status of this important field. Coherent flow of topics, student-friendly language and extensive use of examples make this book an invaluable source of knowledge.