Are solutes and solvents heterogeneous or homogeneous?

Solutes and solvents typically form homogeneous mixtures when combined, resulting in a solution where the components are uniformly distributed at the molecular level. However, if the solute does not fully dissolve in the solvent, the mixture can become heterogeneous, exhibiting distinct phases. In a true solution, such as salt in water, the mixture is homogeneous, while a suspension, like sand in water, is heterogeneous.