1. Deoxyribose sugar: This is a five-carbon sugar that forms the backbone of the DNA molecule.

2. Phosphate group: This is a negatively charged group attached to the deoxyribose sugar.

3. Nitrogenous base: This is a molecule that contains nitrogen and is responsible for carrying genetic information. There are four types of nitrogenous bases in DNA: adenine (A), guanine (G), cytosine (C), and thymine (T).

These three components come together to form a single nucleotide, and many nucleotides link together to form a DNA strand.