The primary ingredient in a meatloaf is ground meat, typically beef, although other types like pork or turkey can also be used. Ground meat serves as the foundation, providing the main protein content of the dish. Meatloaf is often mixed with various ingredients such as breadcrumbs or oats for texture, eggs for binding, and seasonings and vegetables for added flavor. It is then shaped into a loaf and baked, making it a popular comfort food. Meatloaf is versatile, allowing for numerous regional variations and personal recipes.