Double-stranded complementary DNA is a term used to describe a molecule that consists of two strands of nucleotides whose sequence of bases are perfectly complementary to each other. Synonyms for this term could include: duplex complementary DNA, matched nucleic acid strands, properly base-paired DNA, or complementary base-pairing DNA. Another way to describe this molecule is to refer to it as a helix of base-paired nucleotides, or simply as an intact DNA duplex. These synonyms all highlight different aspects of the structure and properties of double-stranded complementary DNA, but ultimately they all refer to the same essential feature of the molecule.