The book of Habakkuk is a record of the messages of the prophet Habakkuk. As with most prophets, Habakkuk’s message focused on current events for the people of Israel, but it also had a secondary meaning, anticipating the life of Jesus.
Habakkuk begins with questions about Israel’s foreign oppressors, including two revelations from God. Habakkuk then pronounces judgment against these oppressors and concludes with a confident prayer for God’s deliverance of Israel.
Habakkuk 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.)