A colloid is a type of mixture in which one substance is dispersed evenly throughout another. It is composed of two parts: a dispersed phase and a continuous phase. The dispersed phase can be either a solid, liquid, or gas, while the continuous phase is usually a liquid or gas. The most common examples of colloids are gels and sols. A GEL is a colloid in which the dispersed phase is a solid and the continuous phase is a liquid. A SOL is a colloid in which the dispersed phase is a liquid and the continuous phase is a gas.