Okay kiddo, have you ever seen a white paper that is really thin and has a slightly transparent look to it? That's called vellum! It's kind of like a see-through paper that you can use for all sorts of different things.
Vellum is made from animal skin usually from cows, sheep or goats. The skin goes through a process of soaking in water and lime to remove any hair, flesh or flesh from it. After that, it is stretched and dried out. This stretching process makes the vellum very strong and durable.
People have been using vellum for a long, long time. Back in the day, before people had the kind of paper we use today, they would often write on vellum. They would use a pen and ink to write on it, and because the vellum was so strong, their writing would be preserved for a really long time.
Nowadays, some people still use vellum for writing and calligraphy. Additionally, it can be used to make special invitations, envelopes, and even lampshades. It's quite versatile!
Does that make sense, kiddo?