Van der Waals force is an attractive or repulsive force between two molecules or atoms. Synonyms of Van der Waals force include London dispersion force, Debye force, Keesom force, induction force, and polarizability force. The London dispersion force arises due to the instantaneous dipole moments of molecules which cause them to attract each other. The Debye force acts between a permanent dipole moment and an induced dipole. The Keesom force is an attraction between two permanent dipole moments, while the induction force arises when an induced dipole interacts with a permanent dipole. Lastly, the polarizability force is an attraction between a polarizable species and an external electric field or polarized species. These various forces play crucial roles in molecular interactions and phenomena such as gas condensation, chemical reactions, and even the stability of biological molecules.