It is the fat from around the kidneys of a pig. I counted 3 videos where DSH addressed rendering lard on their YouTube channel. They explain it much better than I can. Cooked my eggs in the lard this morning; totally different; tasted soooo good. We received 3 lbs frozen, then put it in refrigerator overnight and cut into 1″ cubes while it was firm. It took us about 3 hours to render on medium heat, stirring often so it does not burn. Had to add a slice of cornbread to dip into the eggs. It will become a staple for us.