Here's why:

* Salt (NaCl): When salt dissolves in water, the water molecules surround the sodium (Na+) and chloride (Cl-) ions, breaking the ionic bonds holding them together. This process is called hydration.

* Sugar (C12H22O11): Sugar is a polar molecule, meaning it has a slightly positive and slightly negative end. The water molecules, also polar, interact with the sugar molecules, forming hydrogen bonds and dissolving the sugar.

Therefore, salt and sugar are both soluble in water, not insoluble.