Genomics is a branch of biology that deals with the study of genes and their functions in living organisms. It involves the mapping, sequencing, and analysis of an organism's complete set of DNA, which contains all the information needed to build and maintain that organism. This information can be used for various purposes such as understanding how different species are related, identifying disease-causing genes, developing new treatments or therapies, improving crop plants through plant breeding, and many others. In summary, genomics is the study of the complete set of genetic material in an organism, which helps us understand its biology and potential applications for human health and other fields.