Here's why:

* Solution: A homogeneous mixture of two or more substances, where one substance (the solute) is dissolved evenly into another substance (the solvent).

* Solute: The substance that dissolves in the solvent. In this case, sugar is the solute.

* Solvent: The substance that dissolves the solute. In this case, water is the solvent.

When you mix sugar and water, the sugar crystals disappear and become evenly distributed throughout the water, forming a homogeneous mixture.