Flank steak is a cut of beef taken from the lower chest or abdominal area of the cow. It is known for its rich flavor and relatively lean texture, making it a popular choice for grilling and marinating. This cut is typically long and flat, with a grain that runs in one direction, which is important to consider when slicing for serving. Due to its toughness, flank steak benefits from marinating before cooking to enhance tenderness and flavor. It is often used in dishes like fajitas or served as a main course, sliced against the grain to ensure a more tender bite.