Here's a breakdown:

* DNA (Deoxyribonucleic Acid) is a molecule that carries genetic information.

* Nucleotides are the individual units that make up DNA.

* Each nucleotide consists of three parts:

* A sugar molecule (deoxyribose in DNA)

* A phosphate group

* A nitrogenous base (adenine, guanine, cytosine, or thymine)

These nucleotides link together in a long chain, forming the double helix structure of DNA.