Out of the 4 "gospels" which consist of Matthew, Mark, Luke, and John, the book of Mark is the shortest. With only 16 chapters, Mark tends to spend most of his time focussing on how awesome Jesus is and how many miraculous things He did. His focus is on the actions of Jesus and how the people reacted to Him/them. He starts his book by referencing prophecies by Isaiah as well as Malachi who both spoke about the "messenger" who is sent to "prepare the way" for Jesus.