Oil and Vinegar are two common ingredients used in cooking and salad dressings. Oil, often derived from plants like olives or sunflowers, adds richness and flavor. It can be used for frying, sautéing, or as a base for dressings. Vinegar, made from fermented liquids, provides acidity and brightness to dishes. There are many types, including balsamic, apple cider, and red wine vinegar. When combined, oil and vinegar create a balanced dressing that enhances the taste of salads and vegetables.