* D stands for deoxyribose, which is a type of sugar that forms the backbone of the DNA molecule.

* N stands for nucleic, indicating that it is a type of nucleic acid, a class of biopolymers essential for all known forms of life.

* A stands for acid, which is due to the presence of phosphate groups in the DNA molecule.

DNA is a molecule that contains the genetic instructions for the development and functioning of all known living organisms and many viruses.