What is DNA?
DNA, or deoxyribonucleic acid, is the genetic code, or blueprint, that plays a big part in defining who you are.
Every cell in your body contains a copy of your DNA, which is essentially a microscopic set of instructions that determine what you look like and other personal traits.
This blueprint is called a genome and, while most of that code is the same from one person to the next, there are specific variations that make you unique. Parts of your DNA called genes are responsible for performing biological functions and, in some cases, determining personal traits, like hair color or height. Variations in those genes, and elsewhere in your genome, contribute to the variety and diversity in humans.