An "emollient" is best known for which of the following characteristics?

An emollient is primarily recognized for its softening and soothing qualities. It often refers to substances that are applied to the skin to help maintain moisture and alleviate dryness, thus promoting a smooth and comfortable texture. This characteristic makes emollients especially popular in skincare products aimed at treating conditions such as eczema or psoriasis.

The other choices present characteristics that directly contradict the primary nature of emollients. Being harsh or abrasive is not aligned with the soothing intent of emollients, which are designed to be gentle and restorative. Similarly, increasing irritation or discomfort goes against the purpose of using emollients, which is often to provide relief and nurture the skin. Lastly, while fragrance can be a factor in some skincare products, it does not encapsulate the essence of what an emollient fundamentally represents. Thus, the quality of having a softening or soothing effect is what distinctly defines emollients.