Fettuccine Alfredo is just two things: fettuccine pasta and Alfredo sauce. Chicken Alfredo is three things: fettuccine pasta, Alfredo sauce, and pan-seared chicken. One can be eaten by vegetarians, one cannot. One is for the cheese lovers, the other is for the cheese AND meat lovers. The great thing about Fettuccine Alfredo is that it’s amazing with pretty much anything–so feel free to switch it up and make Shrimp Fettuccine Alfredo, or Broccoli Fettuccine Alfredo, or Bacon Fettuccine Alfredo (health fanatics, just pretend you didn’t read that last one).