Final answer:
A solution is a homogeneous mixture in which the composition is uniform throughout, whereas a mixture can be either homogeneous or heterogeneous. Every solution is a mixture, but not every mixture is a solution.
Step-by-step explanation:
A solution is a homogeneous mixture, meaning it is a mixture of two or more substances that are so intimately mixed that the mixture behaves like a single substance. In other words, the composition of a solution is uniform throughout. On the other hand, a mixture can be either homogeneous or heterogeneous. While every solution is a mixture because it is homogenous, not every mixture is a solution as it can be either homogenous or heterogeneous.
For example, when you dissolve salt in water to form saltwater, the salt particles are evenly distributed throughout the water and the composition is the same in every part of the solution. This makes saltwater a solution because it is a homogeneous mixture. However, if you mix sand and water, the sand particles will settle at the bottom, indicating that the mixture is not uniform throughout. This makes the sand and water mixture a heterogeneous mixture, which is not a solution.