Here in the United States, we have an agency of the government called the Secret Service. Their task is to guard the president and prepare the way for his travels. Wherever the President is going, the Secret Service will arrive hours or days ahead of time to secure his arrival at a particular place. They will section off streets. They will section off buildings. They will perform security checks. All of this is to prepare the way. Then, upon his actual arrival, there is often an announcement: “Ladies and Gentlemen, the President of the United States of America.” Then, Hail to the Chief begins to play.
This is a bit like the role of John the Baptist, who announced the coming of Jesus. Rather than saying, “Ladies and Gentlemen, the President of the United States,” this one would say, “Ladies and Gentlemen, the Messiah, who came to redeem Israel.” Preparing the way for the president of the United States is important, but preparing the way for the Messiah, was much more important.
You can read about it in Mark 1:2-8.