This is your DNA. Your DNA is basically the genetic instruction for your body. The genetic information of an organism is stored and inherited as nucleic acids; the DNA is such an acid. DNA is actually short for Deoxyribonucleic acid.
It is assembled as a double helix structure that can be thought of as a twisted rope ladder, made up of three components: sugar, phosphate and a base pair. The backbone of the ladder is made of sugar and phosphate and the rungs consist of base pairs.
There are four bases called adenine (A), thymine (T), guanine (G) and cytosine (C), which only occur paired as A+T and G+C because of their complementary shape. These bases are held together by weak hydrogen bonds.
The three components of the ladder, so a base-, a sugar- and a phosphate part, together make up what is called a nucleotide. Nucleotides are the building blocks of the DNA so to say.
So now you know how the DNA is built, but where is it located? It doesn’t just randomly swim around in your body; it is found in the chromosomes.