The subunits of DNA are known as:

Deoxyribo nucleic acid (DNA) is the genetic material of living organisms.
Nucleotides are the structural units of nucleic acids.
Each nucleotide has three components. These are as follows-
Sugar- It is a pentose sugar called deoxyribose. It is a five-carbon compound and has a pentagonal ring structure.
Phosphate group- It is derived from phosphoric acid. It has three active -OH groups of which two are involved in strand formation.
Nitrogen bases- These are cyclic compounds made up of carbon, hydrogen, oxygen, and nitrogen atoms. They have five bases under it. Those are adenine (A), thymine (T), cytosine (C), guanine (G), and uracil (U)