Fettuccine alfredo is a popular Italian pasta dish made with fettuccine, a type of flat, thick pasta. The dish is known for its creamy sauce, which is typically made from butter, heavy cream, and grated Parmesan cheese. It is often seasoned with salt and pepper, and sometimes garnished with parsley. This dish originated in Rome and has become a favorite in many countries, especially in the United States. While traditional recipes focus on simplicity, variations may include additional ingredients like chicken, shrimp, or vegetables to enhance flavor and texture.