Computer Applications is an essential skill in academic and occupational areas. This course provides an introduction to and/or refinement of touch skills for entering alphabetic, numeric, and symbol information. This book is a required textbook for all Business occupational/technical programs requiring the use of the computer. This book provides a general introduction to computers systems. A computer system is made up of both hardware and software. Software is another term for computer program. Software controls the computer and makes it do useful work. Without software a computer is useless. Hardware refers to the physical components that make up a computer system. These include the computer’s processor, memory, monitor, keyboard, mouse, disk drive, printer and so on. In this book, we take a brief look at the functions of the different hardware components. In addition, we describe the some of the essential software required for the operation of a computer system. This book will help the readers to have a broader view on Computer Fundamentals. The language used in this book is easy and will help students to improve their vocabulary of technical terms and understand the matter in a better and happier way.