The wound dressing can be classified based on the method of preparation. The development of modern dressing overcomes the traditional dressing in many ways including technology and new material based composite. Traditional dressings developed with cotton wool, natural or synthetic bandages and gauzes, while modern dressings include hydrocolloids, hydrogels, semipermeable adhesive film dressings, foam dressings, biological dressings and tissue engineered skin substitutes. The categorization can be based on the functionality of the dressing (occlusive, absorbent, etc.), the type of material (hydrogel, collagen, keratin, etc.), and the physical form of the product (gel, ointment, etc.). The primary dressings which are in physical contact with
