When particles of two or more substances are distributed evenly among each other, a solution is formed. In more technical terms, this uniform mixture of substances is known as a homogeneous mixture.
In a solution, one substance (the solute) is dissolved in another (the solvent), resulting in a single phase that appears uniform throughout. For instance, when table salt (sodium chloride) is dissolved in water, the salt particles disperse evenly among the water molecules, creating a saline solution. This process is known as dissolution.
The key characteristic of a solution is that the particles of the solute are so small that they cannot be seen and do not settle out over time, unlike suspensions where larger particles may eventually separate from the mixture.