Collidal Solution is somewhat hazy and light if made to fall in this solution gets scattered
Suspension is a solution through which if light is made to fall it straight away passes from it,if the light falls on upper part of solution,but if made to fall in lower part it doesn't passes becoz heavy nonsoluble particles are settled down.
A true solution is clear solution.....through which light passes without any disturbance.
Based on distinct properties, solutions can be classified into True Solution, Suspension and Colloid. 

A colloid is a substance in which microscopically dispersed insoluble particles are suspended throughout another substance. 

a suspension is a heterogeneous mixture containing solid particles that are sufficiently large for sedimentation.Suspension is a heterogeneous mixture in which particle size of one or more components is greater than 1000nm.

True Solution is a homogeneous mixture of two or more substances in which substance dissolved (solute) in solvent has the particle size of less than 10-9 m or 1 nm.