Genomic sequences refer to the complete set of DNA in an organism, which includes all of its genes and non-coding regions. These sequences are made up of nucleotides, the building blocks of DNA, represented by the letters A, T, C, and G. By analyzing genomic sequences, scientists can understand the genetic makeup of organisms, which helps in fields like medicine, agriculture, and evolutionary biology. The study of genomic sequences has advanced significantly with technologies such as next-generation sequencing. This allows researchers to quickly and accurately read large amounts of DNA, leading to discoveries about genetic diseases, biodiversity, and the relationships between different species. Understanding these sequences is crucial for advancements in personalized medicine and biotechnology.