* Solution: A solution is a homogeneous mixture of two or more substances. This means the components are evenly distributed throughout the mixture.

* Homogeneous Mixture: A homogeneous mixture has a uniform composition and appearance throughout.

Therefore, all solutions are homogeneous mixtures but not all homogeneous mixtures are solutions.

Here's an example to clarify:

* Solution: Salt dissolved in water is a solution. The salt and water are evenly distributed, creating a homogeneous mixture.

* Homogeneous Mixture (not a solution): Air is a homogeneous mixture of gases like nitrogen, oxygen, and carbon dioxide. While it's homogeneous, it doesn't fit the definition of a solution because there's no solute dissolved in a solvent.

In summary:

* All solutions are homogeneous mixtures.

* Some homogeneous mixtures are not solutions (like air).