The type of mixture where one substance dissolves into another is called a solution.

Here's why:

* Solution: A homogeneous mixture where one substance (the solute) dissolves completely into another substance (the solvent), forming a single phase.

* Example: Salt dissolving in water. The salt (solute) disappears and is evenly distributed throughout the water (solvent).

Let me know if you'd like to learn more about solutions or other types of mixtures!