A homogeneous solution is a mixture of two or more components that have a uniform appearance and composition. Carbonated water, vodka and saline are all examples of homogeneous solutions.
Homogeneous solutions should not be confused with heterogeneous suspensions, in which the components are made up of larger and less-uniform particles. In order for a homogeneous mixture to be a solution, two different substances must be mixed together. They are usually created by dissolving a lesser amount of substance called solutes into a larger base of liquid called the solvent.
Particles found in homogeneous solutions are typically microscopic and of very similar size. Colloids are homogeneous solutions with particles in between the size of those in heterogeneous suspensions and other homogeneous solutions.