Intramolecular forces are the forces present inside the individual atom, or molecule. These hold the molecule togather using chemical bonding. There are three diffferent types of chemical bonds; ionic, covalent and metalic. Each apply to a different type of molecule.
Intermolecular forces are forces inside of atoms, molecules and ions such as Hydrogen, Dipole- Dipole and london dispersion forces. These are the forces that cause the atoms to attract or reepel each other. They deal with the amount of surface tension, viscosity and other characteristics of particles.