The science of crop breeding delves into the study of genetics of crops to develop desirable characteristics for agriculture and horticulture. Breeding crops is essential for ensuring food security in the context of a growing economy. This is done by developing new crop types that have higher yield, disease resistance, abiotic stress tolerance and also higher adaptability to different environments. Classical plant breeding methods have mostly been replaced by modern methodologies of marker-assisted selection, double haploids and genetic modification. The research in the frontiers of genetic modification and transgenic plants is rapidly progressing with the development of innovative biotechnological tools. This book studies, analyses and upholds the pillars of crop breeding and its utmost significance in modern times. The various advancements in this field are glanced at and their applications as well as ramifications are looked at in detail. This book targets geneticists, food scientists, agronomists, molecular biologists, researchers and students associated with this domain.