Pork loin and pork tenderloin are both cuts of pork, but they differ in terms of location, size, tenderness, and best cooking methods. The loin is a wider, thicker cut from the back of the pig, whereas pork tenderloin is a long, narrow, and cylindrical cut. And pork loin is relatively tender but not as much as pork tenderloin, which is renowned for its exceptional tenderness. Lastly, pork loin is often roasted or cut into chops, while pork tenderloin is typically cooked quickly through methods like pan-searing, grilling, or roasting.