A seal is a little stamp that people in East Asia use to sign their names or mark things as their own. It's like a little picture, usually carved out of stone or wood, with a name or symbol on it.
People in East Asia use seals because they believe it shows their identity and gives their signature more value. They use it to sign important documents or show that something belongs to them.
When someone wants to use their seal, they take some red ink and press the seal onto the paper. This leaves behind the symbol or name, kind of like a fingerprint.
Seals can be really pretty and intricate, with lots of details and designs. Some people collect them as art pieces! Even though they might not be used as much today because there are other ways to sign documents, seals are still an important part of East Asian culture and tradition.