John the Baptist announce the coming of the Savior, Jesus. He not only baptized Jesus, but pointed Him out to his own disciples. This feast is about the birth of John to Elizabeth, who was elderly and the fact that she gave birth to a son was God's doing. Mary heard about the conception of John when the Angel Gabriel came to her to announce the birth of Jesus. Mary went with haste to visit Elizabeth.
The Gospel today tells us about the birth of John. It ends by telling us that "the child grew and became strong in spirit, and he was in the desert until the day of his manifestation to Israel."
His name was chosen by God. John means "God is gracious". This name was given to his father by the angel before he was conceived.
My brother is named John. I hope he knows it means God is gracious.