1) Daniel has a vision of a two-horned ram being attacked and defeated by a goat with a prominent horn between its eyes.
2) The goat's large horn is broken off and replaced by four prominent horns. Another small horn grows and becomes very powerful, threatening heavenly beings.
3) The vision is explained to Daniel - the ram represents the kings of Media and Persia, while the goat is the king of Greece. The small horn represents a future wicked king who will prosper for a time but will ultimately be destroyed.