Theory:

In everyday life, the products we use, such as mayonnaise, jelly, and butter are the colloidal solution.
A colloidal solution is a heterogeneous mixture.
 
In the colloidal solution, the particles of a colloid uniformly spread throughout the solution.
 
A colloidal solution contains finely divided particles (Approximately \(1\) to \(1000\) millimicrons in size), dispersed within a continuous medium in such a manner that prevents them from being filtered easily or settled rapidly.
Example:
1. Milk
2. Hair cream
3. Toothpaste
4. Fog, Mist, Smog
5. Cheese butter
6. Paint etc.
Properties of a colloidal solution:
 
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1. Colloidal solution is a heterogeneous mixture.
2. A colloidal solution is quite stable so that it does not settle down when left undisturbed.
3. Though the size of the particle here is so tiny, you cannot see with naked eyes.
 
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4. Colloidal particles can scatter a beam of light passing through it and make its path visible.
 
Classification of colloids based on the physical state of the dispersed phase and dispersion medium:
  
a. Dispersed phase: The dispersed phase is described as a phase that is scattered or present in the form of colloidal particles.
 
b. Dispersed medium: The dispersed phase is the medium in which colloidal particles are distributed.
 
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S.No
Name
Dispersed phase
Dispersed medium
    Example
1
Solid sol
Solid
Solid
Colored glass, Gems, Alloys. 
2
Sol
Solid
Liquid
Paint, Fruit jellies, Dye, Ink, Egg white
3
Aerosol
Solid
Gas
Smoke
4
Gel
Liquid
Solid
Cheese, Butter.
5
Emulsion
Liquid
Liquid
Milk, Oil in water, Mayonnaise, Face cream.
6
Aerosol
Liquid
Gas
Fog, Mist, Clouds, Body sprays.
7
Foam
Gas
Liquid
Soap lather, Shaving cream, Coffee froth
8
Solid foam
Gas
Solid
Rubber, Sponge, Cake, Bread
Reference: