what does it mean by colloidal solution and tyndall effect?are they both associated with each other?

Colloidal Solution: A colloid is a type of chemical mixture where one substance is dispersed evenly throughout another. The particles of the dispersed substance are only suspended in the mixture, unlike a solution, where they are completely dissolved within. 

 

Tyndall Effect: The effect of light scattering in many directions in colloidal dispersion is known as Tyndall effect. Since, a colloidal solution or substance (like fog) is made up of scattered particles (like dust and water in air), light cannot travel straight through. Rather, it collides with these micro-particles and scatters causing the effect of a visible light beam. This effect was observed and described by John Tyndall as the Tyndall Effect.

Yes, Tyndall effect is seen only in colloidal solution.