Here's a breakdown:

* Solution: A homogeneous mixture of two or more substances.

* Solute: The substance that dissolves in a solvent.

* Solvent: The substance that dissolves the solute.

For example, in a sugar solution:

* Solution: Sugar water

* Solute: Sugar

* Solvent: Water

Key characteristics of a dissolved substance:

* Invisible to the naked eye: The solute particles are evenly distributed throughout the solvent, making the solution appear clear.

* Can be separated by physical means: You can usually separate the solute from the solvent through evaporation or filtration.

* Can affect the properties of the solvent: Adding a solute can change the boiling point, freezing point, and density of the solvent.

Let me know if you'd like to know more about specific examples of dissolved substances!