DNA elongation is a crucial stage of DNA replication in which DNA polymerase enzymes synthesize new strands by continuously adding deoxyribonucleotides to the 3′ end of a growing DNA chain in the 5′→3′ direction, using the original DNA template strands as guides, while accessory proteins such as helicase, primase, and sliding clamps coordinate to ensure high fidelity, processivity, and accurate duplication of the genetic material before cell division.