Here's why:

* Stores Genetic Information: DNA contains the instructions for building and maintaining an organism. This information is encoded in the sequence of its four nucleotide bases (Adenine, Thymine, Guanine, and Cytosine).

* Passed Down Through Generations: During cell division (mitosis and meiosis), DNA is replicated and passed on to daughter cells. This ensures that each new cell receives a complete copy of the organism's genetic blueprint.

* Determines Traits: The specific sequence of DNA bases within genes dictates an organism's traits, such as eye color, height, and susceptibility to certain diseases.

While there are some viruses that use RNA (Ribonucleic Acid) as their genetic material, DNA is the primary hereditary material in most living organisms.