This Book is aims to introduce you to the general knowledge on the concept of a computer, types, evolution, and the basic computer skills you need in order to access information, disseminate and transfer information in the library and within your environment. The Book consists of six modules with eighteen units of study. In this Book, you will learn the concept and evolution of computer, types/classification of computer, functions of computers, operating systems and functions. You will also be exposed to the use of some components of the computer system.