A colloidal solution is a heterogeneous mixture but it appears to be homogeneous because of relatively small size of particles as compared to suspension.
It's particles are uniformly distributed throughout the solution.
Components of colloid
Dispersed phase:- The solute like component or the dispersed particles in a colloid form the dispersed phase.
Dispersion medium:- The component in which the dispersed phase is suspended is known as dispersing medium.
For example in a mixture of milk and water, protein and fat particles are dispersed phase and water is dispersed medium.