Sol and gel are examples of colloids

Explanation:

Let us first understand what is a colloid. A colloid is a mixture wherein a substance with microscopically dispersed insoluble particles is suspended throughout another substance.

Now coming to sol and gel,

Sol is a colloid system wherein solid particles are distributed in a liquid substance. For example Cell fluids.

Gel is a colloidal system wherein liquid particles are distributed in a solid media forming a colloidal solution. For example Jellies.