Define the term 'solvent'.

A solvent is defined as a substance that dissolves a solute, resulting in a solution. This process is essential in various chemical and physical operations, as solvents facilitate the mixing of different substances. For example, when salt is added to water, the water acts as the solvent, dissolving the salt (the solute) to create a saline solution. Solvents can be in various states of matter, including liquids and, in some cases, gases, but they are not limited to just gases. This broad definition allows solvents to play a crucial role in diverse applications such as pharmaceuticals, chemical reactions, and industrial processes. Understanding the role of a solvent is vital for operators working with chemical solutions, as it influences factors like concentration, reaction rates, and the physical properties of the solution.