This book aims to present the most important facts relating to population in a form that is readily understandable by both the nonspecialized college student, to whom it is primarily addressed, and the lay reader interested in learning the significance of population growth and changes as factors influencing many aspects of our daily life in today's world. However, some change has been made in the amount of space devoted to the various aspects of population changes. Composition of the population has received considerably more attention. There is also a somewhat expanded discussion of population policies, which are rapidly becoming of concern to all people.