The Prophet Daniel lived in Babylon in the time of King Nebuchadnezzar. The book itself consists of six stories (Ch. 1-6), which illustrate how faithful Jews, loyally practicing their religion, were enabled, by God’s help, to triumph over their enemies (e.g., the Three Youths in the flaming furnace Ch. 3), and four visions (Ch. 7-12) interpreting current history and predicting the ultimate triumph of the saints in the final consummation.
In addition, the Orthodox Bible (LXX) contains two more chapters (13-14) concerning the stories of Susanna, a righteous Virgin, and the Prophet Daniel, the false god Bel, and the Dragon. The LXX Daniel also contains an additional 68 verses inserted after 3:23, The Prayer of Azariah and the Song of the Three Young Men in the furnace, which is sung at the Liturgy of St. Basil on Holy Saturday.