How can I define intermolecular forces?

A molecule (not an atom!) is held together by attractive forces called intermolecular forces, which come in a variety of forms, including covalent, metallic, hydrogen, van der Waals, ionic, and hydrogen bonding.

Hydrogen atoms share two electrons with oxygen atoms, and water is a primary substance that forms covalent bonds.

Intermolecular forces are the attractive or repulsive forces that exist between molecules. These forces arise due to the interactions between the charged particles within molecules, such as electrons and nuclei, and are responsible for determining the physical properties of substances, such as melting and boiling points, viscosity, and solubility. There are several types of intermolecular forces, including London dispersion forces, dipole-dipole interactions, hydrogen bonding, and ion-dipole interactions.