Calcium Sulfide (CaS) exhibit what type of bond?

$\text{Calcium sulfide, } C a S$, exhibits an ionic bond.
The ionic bond is formed between $C {a}^{2 +}$ and ${S}^{2 -}$ ions to give the same structure as is observed in $N a C l$. The ionic bond means that calcium sulfide is non-molecular, poor solubility as a consequence, and very high melting points