How and why are London Dispersion Forces a type of intermolecular force and Van der Waals force?

One of the many forms of interaction between molecules is
the London dispersion force. London dispersion forces are a kind of van der Waals force
as they arise due to dipoles that are created in molecules. When electrons circle around
atoms their concentration is not the same throughout the sphere they are revolving in.
It changes repeatedly, with one area having a higher negative charge and the other
having a higher positive charge. These charges attract each
other.

London dispersion forces are weak as the dipoles
created due to the change in charge does not have too much of an effect. This force is
increased by an increase in the size of the molecule and the presence of more electrons
in the molecule. So London dispersion forces are stronger between molecules that have
more number of atoms and the atoms themselves are large which increases the atoms that
they have.