Intermolecular forces are those that bring about or result in an action between the molecules. These could include when molecules are attracted or want to move away from each other. One of the main differences between intermolecular and intramolecular forces is the strength of them. Intramolecular forces is by far stronger than intermolecular forces. It will hold the molecules stronger than intermolecular forces.
Intramolecular forces result in a compound. There are different types of bonds used in these too. Intermolecular forces uses covalent bonds whereas the intramolecular forces uses chemical bonds and hydrogen bonds. Some of the intermolecular bonds are not bonded together when compared to the intramolecular forces. Also, with intramolecular forces, they can also have metallic bonds where metallic electrons are used.