Alfredo sauce is a creamy pasta sauce made primarily from butter, heavy cream, and grated Parmesan cheese. It is known for its rich and smooth texture, making it a popular choice for dishes like Fettuccine Alfredo. The sauce is typically seasoned with garlic, salt, and pepper, enhancing its flavor. Originating from Italy, Alfredo sauce gained popularity in the United States in the early 20th century. It is often used in various recipes, including casseroles and as a base for other sauces. Many variations exist, incorporating ingredients like chicken, shrimp, or vegetables for added flavor and nutrition.