The "Book of Daniel" is a book in the Old Testament of the Bible that tells the story of Daniel, a young Jewish man taken captive in Babylon. It includes narratives about his life, such as his interpretation of dreams and his experiences in the lion's den, showcasing his faith and wisdom. The book also contains prophetic visions that reveal future events, including the rise and fall of empires. These visions emphasize themes of divine sovereignty and the ultimate triumph of God's kingdom, making the "Book of Daniel" significant in both Jewish and Christian traditions.