Computer applications have gained increasing importance in recent times due to the growth and development of the electronic, communication, information technology, and computer industry. The book in question has been designed to serve as a comprehensive knowledge base while also helping readers to understand the fundamentals of computer applications. Furthermore, the book explains data analysis using Ms-Excel, providing students with the opportunity to analyze their statistical research data. The book commences with an introductory chapter that covers all topics related to computers and the use of statistical tools in solving problems. The first chapter provides an overview of the anatomy, generation, and classification of computers, as well as discussing personal computers, booting, and viruses. The second chapter, titled Operating Systems, describes the disk operating system and its commands. The third chapter discusses working in Windows, while the fourth chapter describes word processing, including creating, saving, opening, and editing documents, as well as formatting options. The fifth chapter introduces Ms-Excel and explains how to create, edit, and save documents, while the sixth chapter discusses mathematical functions and their use in Excel. The seventh and eighth chapters describe the various features of data analysis using Excel, including data analysis tools, tests, graphs, and ANOVA, along with illustrated examples. The ninth chapter introduces the reader to Ms-Access database, and the tenth chapter provides an overview of the basic concepts of the internet. The eleventh chapter discusses pictures, flowcharts, and algorithms, while the twelfth chapter covers data analysis using Excel.