RNA (Ribonucleic Acid) and DNA (Deoxyribonucleic Acid) are essential molecules found in all living cells. Both are made up of smaller units called nucleotides, but they differ in structure, function, and chemical composition. DNA is a double-stranded molecule shaped like a twisted ladder (double helix). It carries the genetic blueprint of an organism — meaning it contains all the instructions needed for the growth, development, and reproduction of the body. The sugar in DNA is called deoxyribose