Applications and Uses of Computers is the fourth chapter that has been added in the syllabus of Computer Science ICS-I (Intermediate Part-1). Today, Computer Science is widely used in almost 99% of the organizations and its importance cannot be neglected today. After the introduction of Computers, the business world changed forever. Almost 99% of the businesses today use Information Technology to ensure their departments run smoothly. Information Technology is widely used today in the core departments of all the organizations like Human Resources (HR) / Personnel, Finance, Budget and Security. In this chapter the student will learn about the Computers and the opportunities offered by their use, Types of system encountered in everyday life, home, business, industry, education, e-commerce computer simulation, CAM, Cad, weather forecasting, medial use, word processing, Understand how Computers can simplify our work practices.