This chapter tells the story of King Nebuchadnezzar and his dream of a statue with feet of clay. Daniel receives the meaning of the vision in a dream. Its interpretation involves four kingdoms, the last of which will be destroyed by a non-human force. This the first of several such visions in Daniel, each of which appears to cover the same basic time frame but each one advancing slightly chronologically.
Such a phenomenon is called progressive recapitulation, which is also the most compelling theory on how the visions in the Book of Revelation should be viewed. This is in contradiction to the more common view that the whole book should be viewed as visions set out in a strictly chronological manner.