Macaroni salad is a type of pasta salad, served cold made with cooked elbow macaroni and usually prepared with mayonnaise. much like potato salad or coleslaw in its use, it is often served as a side dish to barbecue, fried chicken, or other picnic style dishes. like any dish, national and regional variations abound but generally it is prepared with raw diced onions, dill or sweet pickles and celery and seasoned with salt and pepper.

Source: Wikipedia