A homogeneous mixture has uniform composition throughout the mixture. A homogeneous mixture is also called a solution. A solution contains a mixture of two or more substances which cannot easily be distinguished from one another. For example, when you create a solution by dissolving sugar in water, it is difficult to distinguish the sugar molecules from the water molecules. Both the air you breathe and the water you drink are good examples of solutions.
Drinking water is also homogeneous.
Water may contain calcium, fluoride, salt or sugar. The pure substances remain separate but they mix in with each other to the point where you can't see the difference. A heterogeneous mixture, on the other hand, does not have uniform composition throughout the mixture. In a heterogeneous mixture, the individual substances can easily be distinguished from one another. Mixtures of sand in water, or pebbles in cement, are examples of heterogeneous mixtures.