In scientific language, a solution is a mixture of at least two substances in which the particles of the substances are of atomic or molecular size. A solution is a homogeneous mixture, which means that all parts of the mixture are exactly the same as every other part.
Solutions are formed by having one substance, which is called the solute, dissolve into another substance, which is known as the solvent. According to HowStuffWorks, one of the most abundant solutions in the world is seawater. Seawater consists mostly of salt, which in this case is the solute, and water, which is the solvent.
A solution can occur in any of three states of matter: liquid, solid and gas. Most commonly solutions are liquids that are made of a solid, liquid or gas that gets dissolved into a liquid solvent. Other solutions can be the result of a liquid dissolving into a gas, a solid dissolving into another or a gas dissolving into another gas.
One of the most widely used solvents is water. In fact water is used so much for solutions that any solution that involves water is classified as an aqueous solution. Solutions can be found commonly in cleaning products, beverages and even the fluids that are found in plants and animals.