Here's why:

* Stores genetic information: DNA contains the instructions for building and maintaining an organism. These instructions are encoded in the sequence of its four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T).

* Transmits information: DNA is replicated during cell division, ensuring that each new cell receives a complete copy of the genetic blueprint.

* Universal: DNA is the primary hereditary material in nearly all living organisms, from bacteria to humans.

While some viruses use RNA (ribonucleic acid) as their genetic material, DNA is the dominant and fundamental molecule of heredity in the vast majority of life on Earth.