Gravy is the sauce commonly poured over turkey and mashed potatoes on Thanksgiving.
Traditional Thanksgiving gravy is usually made from turkey drippings, stock, flour or another thickener, and seasonings. Giblet gravy may also use the turkey’s heart, liver, gizzard, or neck to deepen its flavor. The result is typically smooth, savory, and thick enough to coat food while still being pourable.
Gravy became a natural part of the meal because roasting a turkey produces flavorful juices that can be combined with broth. It also adds moisture to foods such as mashed potatoes, stuffing, and slices of turkey. Although turkey gravy is especially associated with the holiday, cooks may use chicken stock or prepare it entirely in advance.
A common mix-up is confusing gravy with cranberry sauce: cranberry sauce is a sweet-tart relish served alongside turkey, while gravy is a warm savory sauce. Regional recipes may include herbs, onions, wine, or giblets, but the dish described in the question is still gravy.