Carbon quantum dots (CQDs) are a novel class of zero-dimensional carbon nanomaterials that are relatively nontoxic and cost-effective and offer desirable properties that make them excellent candidates for various applications. This book introduces the fundamentals of CQDs, natural sources and methods used for their synthesis, and characterization techniques. It addresses applications in biomedical, environmental, electrical, and other areas. • Covers current research and future possibilities• Details modern fabrication methods and drawbacks• Discusses applications in biomedical use, wastewater treatment, electrical and electronics, dye removal, 3D printing, and metal detection• Provides insight into cytotoxicity and biocompatibility studies on these materialsThe detailed insight into these nanomaterials in this reference will benefit researchers, scientists, engineers, and advanced students in developing new methods and strategies in this advanced field of materials engineering.