This is the shortest book in the Scriptures. Throughout the history of YAHWEH's people, Edom was always antagonistic towards the nation of Israel, YAHWEH's chosen people. Edom is the nation which sprung up from Esau. In accord with Genesis 25:30 (and elsewhere), Esau and Edom are the same. Do you remember the conflicts between Jacob and Esau? That conflict continued between Edom and Israel. This is one of the prophetic books, despite being so short.
There is nothing known concretely about who the true author of this book was or when it was written, though there are some opinions as to time frames which you can research on your own. We will be using the New King James Version for the text.
Be sure to check what you learned by taking the quiz at the end!