Full of supernatural wonders, this book is a record of the life and prophetic end time revelations given to Daniel (whose name means, God is the judge), as a captive Jew in Babylon. Select revelations given to David, Haggai, Zephaniah, and Zechariah are also included within the book. It is a course in a certain point in history, and Israel's relationship to it. Jerusalem was in ruins and many Israelites were captive in Babylon.
Beginning with four boys in a pagan land ruled by a prideful king, and ending with the king's recognition of the presence of God in these four, the Lord used this king to reveal an outline of His plan. He revealed the human empires (present and future) that would come and go right up to the time of the end when the true kingdom of God will come forth.
When the meaning of the word "Daniel" is fulfilled in us we will stop judging by our own criteria. We will not judge according to appearances and we will not judge on our own. If we live in harmony with the presence of our Lord in us, we will fulfill his will, do his work, and express his words; then the judgment of God will flow in and through us. This same judgment is what Daniel illustrates to both Israel and the Gentile nations with his God-given interpretations of visions and dreams.
The book of Daniel, sealed until the time of the end, contains a prophetic mystery given directly from God that Daniel was not able to understand (and neither has anyone else until recently) because it wasn't the time, but the revelation is being unsealed now and if God opens our understanding we can receive it because it's about to be fulfilled.