Molecular interaction refers to the forces that act between molecules, influencing their behavior and properties. These interactions can include attractions and repulsions, which are essential for processes like chemical reactions, biological functions, and material properties. Common types of molecular interactions include hydrogen bonds, van der Waals forces, and ionic bonds. Understanding molecular interactions is crucial in fields such as biochemistry, pharmacology, and materials science. For example, in drug design, knowing how a drug molecule interacts with its target can help create more effective treatments. Overall, these interactions play a vital role in the structure and function of all matter.