A marinade is a mixture of different liquids used to season things like veggies, tofu, tempeh, meat, or fish before cooking. A marinade is used to enhance a recipe or ingredient, and add depth of flavor.
Fire roasted tomatoes are exactly as they sound, charred tomatoes over an open flame. Which are then diced and canned. Fire roasted tomatoes give any dish a nice smokey flavor. A great addition to any salsa, soup or sauce.