CRISPR/Cas has emerged, as a powerful genetic engineering tool. It is simple yet highly affordable and robust. This book provides a basic introduction to the mechanism and architecture of the CRISPR/Cas. It enlightens the readers about the new advancements such as gene insertion, transcriptional activation, suppression, gene tagging, multiplexing, base editing, prime editing, and tissue culture free editing which makes it easier for crop improvement. With such technologies, application of genome editing has opened new paths for crop improvements and sustainable agriculture. The current book will be useful for beginners to understand these tools and how to use them in a better and more efficient way.