Final answer:
A first-degree burn, also known as a superficial burn, is a burn that affects only the epidermis and typically heals on its own within a few days.
Step-by-step explanation:
A first-degree burn, also known as a superficial burn, is a type of burn that affects only the epidermis (the outer layer of the skin). These burns are caused by mild heat exposure, such as sunburn, and typically heal on their own within a few days. Although painful and swollen, first-degree burns do not result in blistering or significant tissue damage.