A pork loin is a wide thick boneless or bone-in cut of meat, producing large pieces when sliced, and is cut from the back rib cage area of a pig. Pork loin makes great roasts and is used to make Canadian bacon. Pork tenderloin is a long and narrow, boneless cut from the central spine portion of the pig. The tenderloin comes from the full pork loin. As the name indicates, the tenderloin is one of the most tender cuts of pork. Typically, pork tenderloin weighs between ¾ and 1 ½ pounds.