What kind of mixture is a solution

The answer is homogeneous.

The best description is homogeneous. The particles which are dissolved are invisible, which is why solutions, unlike colloids or suspensions, are always clear.

A simple solution is basically two substances that are evenly mixed together. One of them is called the solute and the other is the solvent. A solute is the substance to be dissolved (sugar). The solvent is the one doing the dissolving (water).