Answer:
A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance. Some definitions specify that the particles must be dispersed in a liquid, while others extend the definition to include substances like aerosols and gels.
Colloids are characterized by the Tyndall effect and Brownian motion. Brownian motion is the random motion of the particles, which allows them to stay in solution. The Tyndall effect is how the light scatters against those particles, allowing a beam of light to be seen within the colloid itself
