Molecular interactions refer to the forces that occur 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 the formation of materials. Common types of molecular interactions include hydrogen bonds, ionic bonds, and van der Waals forces. 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.