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Facts:

The term "messenger" refers to someone who is given a message to tell others.

In ancient times, a messenger would be sent from the battlefield to tell people back in the city what was happening.
An angel is a special kind of messenger whom God sends to give people messages. Some translations translate "angel" as "messenger."
John the Baptist was called a messenger who came before Jesus to announce the Messiah's coming and to prepare people to receive him.
Jesus' apostles were his messengers to go share with other people the good news about the kingdom of God.
A "herald" is a messenger who carries messages from rulers to their subjects.