Skirt steak is a cut of beef steak from the plate. It is long, flat, and prized for its flavor rather than tenderness. It is not to be confused with flank steak, a generally similar adjacent cut nearer the animal’s rear quarter.
Also called the short plate (or "long plate" depending on where it's separated from the rib primal above it), the beef plate primal includes the short ribs. It is also where the skirt steak is located, which is used in carne asada. Since it has coarse muscle fibers, be sure to slice it against the grain or it will be chewy.