The term "molecular" refers to anything related to molecules, which are the smallest units of a chemical compound that retain its properties. Molecules are made up of atoms, which are the basic building blocks of matter. For example, a water molecule, represented as H2O, consists of two hydrogen atoms and one oxygen atom. Molecular science is essential in various fields, including chemistry, biology, and medicine. Understanding molecular structures and interactions helps scientists develop new materials, drugs, and technologies. For instance, studying molecular biology allows researchers to explore the functions of DNA and proteins in living organisms.