The main ingredient in traditional American barbecue sauce is typically tomatoes, which provide a rich, tangy base. Tomato-based sauces often include additional ingredients such as vinegar, sugar, spices, and various flavorings to create a balance of sweetness, acidity, and spice. Regional variations exist, with some sauces emphasizing mustard (in the Carolinas) or vinegar (in Eastern Carolina) instead of tomatoes. Barbecue sauce is used as a marinade, basting sauce, or condiment for grilled or smoked meats, enhancing their flavor and providing moisture. Its versatility makes it a staple in American barbecue culture and gatherings.