What distinguishes a dressing from a bandage?

The distinction between a dressing and a bandage is rooted in their primary functions. A dressing is specifically designed to cover a wound to promote healing and protect it from infection. It provides a sterile environment and can help absorb any exudate from the wound. On the other hand, a bandage serves the purpose of holding the dressing in place, securing it so that it remains effective and does not move or come off.

In this context, the understanding of wound management is clear: the dressing is the initial barrier against environmental factors, while the bandage ensures that this barrier remains intact. Therefore, option B accurately captures this fundamental difference by stating that a dressing is used to cover a wound, while a bandage secures it. This functional distinction is essential in first aid and medical practices.