Red chili powder is a spice made from dried and ground red chilies, known for its vibrant color and heat. It varies in flavor and heat depending on the type of chili used, such as cayenne or paprika. Common in many global cuisines, it's essential in spice blends, marinades, and sauces. Nutritionally, it offers capsaicin, vitamins A, C, E, B6, and antioxidants. Store in an airtight container away from light and moisture. Handle with care to avoid skin irritation, and consider substitutes like paprika or cayenne pepper if needed.