A colloidal solution, occasionally identified as a colloidal suspension, is a mixture in which a substances regularly suspended in a fluid. A colloid is a minutely small material that is regularly spread out all through another substance.

The components of a colloidal solution are the dispersed phase and the dispersion medium. The solute-like component or the dispersed particles in a colloid form the dispersed phase, and the component in which the dispersed phase is suspended is known as the dispersing medium. Colloids are classified according to the state (solid, liquid or gas) of the dispersing medium and the dispersed phase.

Colloidal solutions have three sub-classifications: Foams, emulsions and sol. 

Foam in this setting is created by ensnaring a gas in a liquid. The substance being dispersed would be the gas, triggering the fluid to become frothy and foamy. A sample of this would be shaving cream. 

An emulsion is a combination of liquids; it’s basically when one liquid is consistently dispersed all through another liquid. 

A sample of this would be mayonnaise or milk. The third form is called a sol, which is when a solid is evenly dispersed throughout a fluid. Samples of sols include paint, blood and silver aquasols.