A molecular model is a visual representation of molecules, which are groups of atoms bonded together. These models help scientists and students understand the structure, shape, and behavior of different substances at the molecular level. They can be simple, like ball-and-stick models, or more complex, like space-filling models that show how atoms occupy space. Molecular models are essential in fields such as chemistry, biochemistry, and materials science. They allow researchers to predict how molecules will interact, which is crucial for developing new drugs, materials, and understanding biological processes.