Codex Cairensis is a very old book that has lots of stories and information about the Bible in it. Think of it like a very important library book that people used to learn about the stories in the Bible a long time ago.
The book is written on sheets of paper that are made from animal skin (called parchment) and the writing is done by hand using special ink. Because it is so old, the writing can be hard to read and the pages are fragile, so people have to be very careful when looking at it.
The Codex Cairensis has been around for a very long time and it has traveled to many different places throughout history. It is very important because it is one of the oldest copies of the Bible that we have today. The book is written in a language called Coptic, which is a language that was spoken in ancient Egypt.
Although the Codex Cairensis is very old, it is still a valuable resource for people who want to learn about the Bible and its history. People can study the pages and learn more about how people used to read and write long ago. It teaches us about the past and helps us understand our present time better.