An ionic bond is a chemical bond formed by the electrostatic attraction between oppositely charged ions. In the case of calcium bromide, the calcium atom loses two electrons to the bromine atom, resulting in the formation of a positively charged calcium ion (Ca2+) and two negatively charged bromide ions (Br-). The electrostatic attraction between the calcium and bromide ions holds the compound together.

Ionic compounds are typically hard, brittle, and have high melting points and boiling points. They are also good conductors of electricity when dissolved in water or melted.