A genome is the entire genetic material of an organism, including all of its genes and non-coding DNA sequences. It is the blueprint that determines the physical and functional characteristics of an organism. The genome is composed of DNA in most organisms, but some viruses have RNA genomes. The DNA sequence of a genome contains all the information necessary for an organism to develop and function. The study of genomes is called genomics, and it has revolutionized our understanding of biology and medicine. By analyzing genomes, scientists can identify genes responsible for specific traits or diseases, and develop new treatments and therapies.