Final answer:
The interaction formed between two ions is known as an ion-ion interaction, which is part of ionic bonding.
Step-by-step explanation:
The name of the interaction that would form between two ions is called an ion-ion interaction. This type of interaction is characterized by the electrostatic attraction between positively and negatively charged ions, which is a fundamental aspect of ionic bonding in an ionic solid. In solutions, ions may also engage in ion-dipole interactions if the solvent is polar, as seen when ionic substances dissolve in water.