What does Matthew 11:13 mean?

"The Prophets and the Law" are what we now call the Old Testament Scriptures. The law is God's specific instructions for the nation of Israel; these are mostly found in the Law of Moses: the first five books of the Bible. "The Prophets" includes the writings of all of God's hand-picked messengers: men like Isaiah, Daniel, and Ezekiel, who delivered His words to His people and others.

Jesus states now that all those writings pointed forward to the last prophet of that era: John the Baptist, who prepared the way for the Messiah (Malachi 3:1). Once John introduced Jesus to the world as the "one who is to come" (Matthew 11:3), those prophecies were fulfilled. Predictions about the coming of the Messiah were active "until John;" he ushered in the age of the Messiah and the nearness of the kingdom.