A solution is defined as a homogeneous mixture of two or more substances. Usually, it consists of one substance (the solute) being dissolved in a second substance (the solvent).

Solute – substance which is dissolved.
Solvent – substance in which a solute dissolves.
Aqueous (aq) solution – a solution using water as a solvent.

Water is the most common solvent on Earth and life depends upon it. In fact, we can be classified as an aqueous solution.
Water is unique in its ability to dissolve many different compounds because of its structure. Water molecules are “V” shaped with hydrogen atoms at each end and an oxygen atom at the vertex.