Which property distinguishes a homogeneous mixture from a heterogeneous mixture?

A homogeneous mixture is defined by its uniform composition and appearance throughout, whereas a heterogeneous mixture has a non-uniform composition. Unlike heterogeneous mixtures, homogeneous mixtures cannot be separated by simple filtration; they usually require methods like evaporation or distillation. An example of a homogeneous mixture is salt dissolved in water, while sand in water is an example of a heterogeneous mixture.