This book explores the importance of cancer stem cells and their usage. Cancer is a serious health issue that affects people all over the world. Numerous studies back up the theory that stem cells play a role in cancer development. The population of cancer stem cells (CSCs) exhibits tumorigenic potential and possesses stem cell-specific markers and characteristics, such as self-renewal/proliferation and differentiation. Carcinogenesis may be significantly influenced by CSCs. Currently, treatment techniques concentrate on eliminating the CSC subpopulation using various methods, such as bypassing CSC resistance mechanisms or focussing on important biochemical pathways that govern these cells. New approaches are still required even though the negative effects of current treatment approaches are minimal. The information that has been gathered on the stem cell theory of carcinogenesis, the impact of dysregulated stem cell self-renewal on cancer transformation, and the functions of CSCs in cancer treatment are presented in this book. We also discuss how a deeper comprehension of the biology, behaviour, and environment of CSCs can advance the use of these cells in cancer therapy and lead to the development of more potent cancer treatment plans. Given its scope, Cancer Stem Cells and Cancer Therapy is an indispensable resource not only for researchers working in the field of human biology and cancer research but also for advanced students seeking an introduction to cancer stem cells and their therapeutic usage.