Molecular structures refer to the arrangement of atoms within a molecule, which is a group of atoms bonded together. These structures determine the molecule's properties and behavior. For example, the water molecule consists of two hydrogen atoms and one oxygen atom, arranged in a specific way that gives it unique characteristics, like being a liquid at room temperature. Understanding molecular structures is essential in fields like chemistry and biochemistry. Scientists use models to visualize these structures, helping them predict how molecules will interact with each other. This knowledge is crucial for developing new medicines and materials, as it allows researchers to design molecules with desired functions.