Salad dressing refers to a sauce or condiment that is poured over a salad, enhancing its flavor and adding moisture. It can be made from a variety of ingredients such as oil, vinegar, lemon juice, herbs, spices, and other seasonings. Salad dressings come in different varieties including vinaigrette, ranch, Italian, French, Caesar, and many more. They can be used to add flavor or provide a healthy dose of nutrients to the salad.