1. Sugar (solute): This is the substance that dissolves in the solvent. In this case, it's usually sucrose (table sugar), but it could be other sugars like glucose or fructose.

2. Water (solvent): This is the substance that dissolves the sugar. It acts as the medium for the sugar molecules to disperse and form a homogeneous mixture.

So, a sugar solution is a mixture of sugar dissolved in water.