What is the Difference Between Similar But Different Things, Terms, and Objects

What is the Difference between Chesty Cough, Dry Cough and Wet Cough

Cough is a common disease in our society.  It is a viral disease which can be transfer from one infected person to other. It is a release of air from lungs. It can be heard easily. It is protective for respiratory system because it clears the system from irritants and secretions.