Ultraviolet-B radiation (UV-B) plays a critical role in shaping plant growth and development, yet its effects span from molecular biology to ecology, with significant implications for ozone depletion and geographic variability. This book, authored by B.R. Jordan, offers an insightful exploration of the broad-scale impacts of UV-B on plants while delving into the intricate mechanisms at play at the cellular level. The recent characterization of the UV-B photoreceptor adds a new layer of understanding to this complex topic. Despite its potential for damage, UV-B radiation also enhances plant photomorphogenesis, leading to innovative horticultural practices. This comprehensive synthesis provides a timely overview of current knowledge and future research needs in the field, making it an essential read for scientists, researchers, and students interested in plant biology and environmental science.