Here's why:

* Homogeneous Mixture: A homogeneous mixture has a uniform composition throughout. This means the components are evenly distributed and you can't visually distinguish them.

* Heterogeneous Mixture: A heterogeneous mixture has a non-uniform composition. You can visually identify different components or phases.

When salt (NaCl) dissolves in water, the salt crystals break down into individual ions (Na+ and Cl-) that are dispersed evenly throughout the water. You can't see the salt anymore, and the solution has a uniform taste and appearance. This makes it a homogeneous mixture.