Daniel is a book of the Jewish Tanach and Christian Bible Old Testament. It is in the section known as the Hagiographa (Hebrew Khethubim). It consists of two distinct parts. The first part, consisting of the first six chapters, is chiefly historical; and the second part, consisting of the remaining six chapters, is chiefly prophetical.
The historical part of the book treats of the period of the Captivity. Daniel is "the historian of the Captivity, the writer who alone furnishes any series of events for that dark and dismal period during which the harp of Israel hung on the trees that grew by the Euphrates. His narrative may be said in general to intervene between Kings and Chronicles on the one hand and Ezra on the other, or (more strictly) to fill out the sketch which the author of the Chronicles gives in a single verse in his last chapter: 'And them that had escaped from the sword carried he [i.e., Nebuchadnezzar ] away to Babylon; where they were servants to him and his sons until the reign of the kingdom of Persia'" (2 Chr. 36:20). See also History of ancient Israel and Judah, History of Persia.
The prophetical part consists of three visions and one lengthened prophetical communication.
The genuineness of this book has been much disputed, but supporters claim the following: (1.) We have the testimony of Christ (Matt. 24:15; 25:31; 26:64) and his apostles (1 Cor. 6:2; 2 Thess. 2:3) for its authority; and (2)the important testimony of Ezekiel (14:14, 20; 28:3). (3.) The character and records of the book are also entirely in harmony with the times and circumstances in which the author lived. (4.) The linguistic character of the book is, moreover, just such as might be expected. Certain portions (Dan. 2:4; 7) are written in the Chaldee language; and the portions written in Hebrew are in a style and form having a close affinity with the later books of the Old Testament, especially with that of Ezra. The writer is familiar both with the Hebrew and the Chaldee, passing from the one to the other just as his subject required. This is in strict accordance with the position of the author and of the people for whom his book was written. That Daniel is the writer of this book is also testified to in the book itself (7:1, 28; 8:2; 9:2; 10:1, 2; 12:4, 5).
Initial text from Easton's Bible Dictionary, 1897 -- Please update as needed