London Dispersion Forces are weak intermolecular forces that arise from temporary fluctuations in electron distribution within atoms and molecules. These fluctuations create temporary dipoles, which can induce dipoles in neighboring particles, leading to an attraction between them. This type of force is present in all molecules, whether they are polar or nonpolar. Although London Dispersion Forces are the weakest type of intermolecular force, they become significant in larger molecules with more electrons. As the size and number of electrons increase, the strength of these forces also increases, influencing properties like boiling and melting points in substances such as noble gases and alkanes.