The Book of Enoch is a very old book that tells stories about angels and the end of the world. It was written a long, long time ago by a man named Enoch, who was supposed to be very close to God. People thought that Enoch's book was really important because it talked about things that nobody else had ever written about.
The book has lots of stories about angels, who are special messengers from God. These angels had names like Uriel and Ramiel, and they did a lot of really interesting things. Some of them helped Enoch see visions of the future, while others punished people who did bad things.
One of the most important things the Book of Enoch talks about is the end of the world. Enoch predicted that there would be a time when the world would be full of evil and sin. He said that God would have to send a flood to wash away all the badness and start again.
Even though the Book of Enoch was really important to a lot of people, it wasn't included in the Bible like the other books were. But some people still read it today because they think it's interesting and contains important messages about God and faith.