DNA is an important part of the human hereditary system that helps in biological formation and characterization. The major part in the formation of a DNA is nucleotides which is an essential compound that offers significantly great advantages biologically to a human body to keep in healthy and prevent the attack of a disease. A sequence of nucleotides is important in the structure of DNA because it forms a unique genetic formation of a human being. According to scientists, the correct sequence of nucleotides in DNA helps in finding the relationship between two people or identifying bodies at the crime scene.