The book of Micah records the messages of the prophet Micah. As with most prophets, Micah’s message focuses on current events — in this instance for the people of Samaria and Jerusalem — and it also had a secondary meaning, anticipating the life of Jesus.
Micah was a younger contemporary of Isaiah and may have been influenced by Isaiah’s example. Micah foretold about the coming destruction of Israel and Judah because they had turned their backs on God. However, his message has a happy conclusion as the dispersed peoples would later be reunited and exalted by a loving and forgiving God.
Micah is sometimes called a minor prophet. This doesn’t mean he wasn’t important, but merely that the book named after him is shorter. (Compare this to the major prophets, whose books are much longer.)