This edited book covers all aspects of omics approaches used for the varietal improvement of millets in changing climatic conditions. Millets are the collection of small-grained cereal grasses, that are grown for human carbohydrate needs. They are among the oldest crops, mainly divided into two groups – Major and small millets based on seed size. Small millets are earlier considered orphan crops, but recently due to their nutritional values, they are getting importance in cultivation. This book explores the genomics, transcriptomics, proteomics, metabolomics, bioinformatics, and other omics tools that are being widely used to get a clear understanding of mechanistic approaches taken by plant genes to tolerate stress. Various reports are published based on field breeding on these crops, and recently the genome of some of the small millets is released, and many omics studies are published related to its application in varietal improvements. This book reviewed all those recent studies and is of interest to research students, plant breeding scientists, teachers that are working in agriculture and plant biotech universities. Along with this, the book serves as reference material for undergraduate and graduate students of agriculture, and biotechnology. National and international agricultural scientists, policymakers will also find this to be a useful read.