What are the Oracle bones in Shang Dynasty?

In fact, it is the Oracle Bone Inscriptions we see now. No matter what great events happen in the country at that time, we must predict in advance to see good or bad luck. The specific method of divination is to roast tortoise shells and animal bones on the fire, and then predict good or bad according to the direction of cracks, and engrave relevant contents on the Oracle bones, that is, Oracle bones.

Modern people don't know what it is when they are unearthed. It was once sold as a keel in a drugstore. Later, after textual research by ancient philologists, it was found that it was the embryonic form of ancient Chinese characters and Chinese characters, namely Oracle Bone Inscriptions.