Salt water is a solution, not a recipe with multiple ingredients. It's simply water (H2O) mixed with salt (NaCl).

Here's a breakdown:

* Water: The solvent, the substance that dissolves the solute.

* Salt: The solute, the substance that gets dissolved.

The ratio of salt to water determines the salinity (saltiness) of the solution. For example, seawater has a much higher salinity than the water you drink from the tap.