A homogeneous mixture is composed of two or more substances mixed together that does have a uniform composition. If we removed samples of the mixture from different locations the composition of the two samples would be identical. Also a homogeneous mixture will remain homogeneous forever.

A homogeneous mixture contains two or more different substances in the same phase, that is, the mixture is a single phase.

All mixtures of gases are homogeneous. Homogeneous mixtures can also be prepared when the components are liquids, liquid and solids. Homogeneous solid mixtures are difficult to prepare.

Solution is another term used to mean a homogeneous mixture. An aqueous solution of sodium chloride would be a homogeneous mixture of sodium chloride and water. We would not say a solution of water and gasoline, because those two components do not form a homogeneous mixture.