Here's why:

* Salt is a compound formed by the reaction of an acid and a base, resulting in the formation of a cation (positive ion) and an anion (negative ion).

* CaCl2 is formed by the reaction of calcium hydroxide (Ca(OH)2, a base) and hydrochloric acid (HCl, an acid).

* CaCl2 is composed of a calcium cation (Ca²⁺) and two chloride anions (Cl⁻).

Therefore, CaCl2 fits the definition of a salt.