DNA damage is termed as the damage that is caused to DNA by naturally occurring processes such as hydrolysis and metabolism and ultraviolet radiation. DNA repair is the process by which the body rebuilds damaged DNA. The symptoms of DNA damage is the development of lesions which cause breaks in the strands of DNA or remove base pairs from the DNA backbone. Aging, cancer, and apoptosis are long-term symptoms of DNA damage. This book provides significant information of this discipline to help develop a good understanding of DNA damage and repair. It aims to serve as a resource guide for students and experts alike and contribute to the growth of the discipline.