Molecular structure refers to the arrangement of atoms within a molecule, which is the smallest unit of a chemical compound. This structure determines the molecule's properties and behavior. Atoms are held together by chemical bonds, such as covalent or ionic bonds, and the way they are connected influences how the molecule interacts with other substances. The molecular structure can be represented in various ways, including structural formulas and three-dimensional models. Understanding molecular structure is essential in fields like chemistry, biochemistry, and materials science, as it helps scientists predict how molecules will react in different environments and applications.