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We often study Polarity, and you must have a good idea about what exactly it is. The atoms and molecules which have both positive and negative charges are Polar. The electrons are shared unequally and the atom having more electronegative force attracts the other atom towards it.
For example, H2O or water is made up of 2 Hydrogen and 1 Oxygen atom. Being more electronegative, the O attracts the H atom and forms a covalent bond. The oxygen atom has six electrons in the valance shell which are more than that of Hydrogen. Due to this, O attracts H strongly and reacts to form water molecules.
From this, O atoms gain slightly negative and slightly positive electrons. These attractions between the molecules are called Intermolecular Forces.