Here's why:

* Solvent: The substance that dissolves the solute (the substance being dissolved).

* Solute: The substance being dissolved.

* Solution: The homogeneous mixture formed when the solute dissolves in the solvent.

In brine, salt (NaCl) is the solute, and water (H₂O) is the solvent. The salt dissolves in the water to form a homogeneous solution.