This is an overview of solutions or homogeneous mixtures, which have a uniform and even composition. They are different from heterogeneous mixtures or suspensions, which are not evenly mixed, and eventually settle out or separate out. Solutions are made of a solute and solvent. We'll look at liquid solutions with gases, solids, and liquids, and particularly aqueous solutions. We'll also look at solutions of gases, and solutions of solids, which are often metal alloys. This information is helpful for AP and IB exams, IIT, JEE, and other Indian exams. Also for O levels and A levels.