Carbonara sauce is a traditional Italian sauce that often includes hard cheese, like Romano and/or parmesan, eggs, pork, like pancetta, and pepper that is typically served over spaghetti. Over the years it had changed to include cream making the sauce velvety and rich, and often you will see bacon used in place of the pancetta. Pasta variations have also been introduced including almost every variety. With the introduction of zoodles and other vegetable noodles, you will often see it served as part of a low carb lifestyle. While it is similar to alfredo sauce, they aren't exactly the same.