Offal refers to multiple edible animal organs, not just one specific part. Chicken hearts and livers are both considered offal.
Pro Tip 2/3
Culinary Delicacy
In some cultures, certain offal is a delicacy and eaten on special occasions. At the festival, they served the prized offal, duck liver pâté.
Pro Tip 3/3
Acquired Taste
Offal can have strong flavors; some people may need time to enjoy it. I wasn't sure about tripe at first, but after a while, I started to like this type of offal.