​This book is a broad collection of short and concise chapters addressing important issues relating to population levels, trends, and differentials. In addition to traditional population concerns, such as growth, composition, fertility, mortality, and migration, the articles address a broad range of related issues, including climate change, environmental degradation, socio-economic development, and policy development. The articles are concise, focused on specific issues, and presented in a style that avoids technical jargon and is easily understood by a broad range of readers. The articles are not only aimed at conveying population information, but also providing important messages for informed policy formulation and program implementation. Among the many issues addressed are human rights, laws, women, gender, climate change, COVID-19 pandemic, ageing, retirement, and abortion. Written in an accessible way, the book will appeal to many general readers wishing to know more about population issues.