The DNA helix is the structure that carries genetic information in our cells. Known as a double helix, the DNA structure consists of two strands that twist around each other, forming a spiral shape. Each strand is made up of small units called nucleotides. There are four basic types of nucleotides: adenine (A), thymine (T), guanine (G), and cytosine (C). Adenine pairs with thymine, and guanine pairs with cytosine. These pairings help keep the strands together. The structure of DNA is crucial for encoding genetic information and copying this information during cell division. DNA forms the foundation of biological diversity and passes traits from one generation to the next.