In Unit 1of this Block, you have been exposed to a general level understanding of what libraries are, why they are invaluable and important to society, in particular to institutions engaged in education, life-long learning, research, culture, recreation and entertainment.In this Unit, we will discuss the origin and growth of various types of libraries and learn about factors that have contributed to their growth and developments. Starting with a discussion on types of libraries, followed by types of library models, this introduces you to their functions, document resources that users need and the unique services that libraries offer.Engineers have been important to every civilization, ancient and modern. They invent, design, build and produce most of the products that make up the present civilization. They find out the solutions to the practical problems faced by the society. Hence, they play a key role in socio-economic development of any nation.Today, engineers require not onlyadequate technological ability and problem solving skills, but also skills like cooperation, communication, and presentation skills, business ethics and inter- personal relationship.