A mixture that forms when one substance dissolves another is called a solution.

Here's a breakdown:

* Solution: A homogeneous mixture, meaning the components are evenly distributed throughout.

* Solvent: The substance that does the dissolving (usually present in larger amounts).

* Solute: The substance that gets dissolved (usually present in smaller amounts).

For example, sugar dissolving in water:

* Sugar: Solute

* Water: Solvent

* Sugar water: Solution