Hello, a seal is stationery printed on a document to show your identity or signature. Generally, seals are stained with pigment before printing. Those that are not stained with pigment and will appear concave and convex after printing are called steel seals, and some are wax prints printed on wax or wax or envelopes. Made of jade, metal, wood, stone, etc. Chinese seal is one of the representatives of Han traditional culture. I hope I can help you.