CRISPR-Cas9 is a revolutionary tool used in genetic engineering. It allows scientists to precisely edit DNA in living organisms. The system consists of two main components: CRISPR, a segment of DNA that guides the editing process, and Cas9, an enzyme that cuts the DNA at a specific location. This enables researchers to add, remove, or alter genetic material, making it easier to study genes and develop treatments for diseases. The technology has numerous applications, including agriculture, where it can create crops with desirable traits, and medicine, where it holds potential for curing genetic disorders. As a powerful and versatile method, CRISPR-Cas9 is transforming the field of genetics.