There are two well known individuals named John in the Bible, John the Baptist and John the Apostle. John the Apostle was one of Jesus Christ's 12 disciples. John the Apostle is widely considered one of the leaders of the early church. John the Baptist was a prophet known for his use of the baptism. Baptism is the process of immersement in water to be cleansed of your prior sins and become a new creature in Christ.
John the Baptist is known for anticipating the coming of Jesus Christ and laid the groundwork for the Messiah's work. John's father is the priest Zecharias. The angel Gabriel visited Zecharias and informed him about the coming birth of his son and his purpose on earth. John the Baptist was decapitated by the Roman king Herod.
John the Apostle was one of the only Apostles in the Bible that did not forsake Jesus Christ. John the Apostle is the author of the New Testament book of John. He is also referred to as John the Evangelist because of his importance in spreading the word of God following the death of Jesus Christ. In the biblical verse John 20:2, John the Apostle is referred to as the "one whom Jesus loved."