Gospel of John in Wikipedia

The Gospel According to John (Κατὰ Ἰωάννην εὐαγγέλιον, τὸ εὐαγγέλιον κατὰ Ἰωάννην, kata Iōannēn euangelion, to euangelion kata Iōannēn), commonly referred to as The Gospel of John, is an account of the life and ministry of Jesus of Nazareth. It details the story of Jesus from his Baptism to his Resurrection. In the standard order of the canonical gospels, it appears fourth, after the synoptic gospels Matthew, Mark and Luke. The Gospel's authorship is anonymous. However, in chapter 21 it is stated that it derives from the testimony of the 'Disciple whom Jesus loved', identified by Early Church tradition with John the Apostle, one of Jesus' Twelve Apostles. It is closely related in style and content to the three surviving Epistles of John such that most commentators routinely treat the four books together.[1]:p.63 Scholarly opinion is divided as to whether these epistles are the work of the evangelist himself or of his followers writing in his name. The epistles are addressed to a particular but unnamed church community. Most scholars presume that the Gospel, too, is addressed to the specific circumstances of that community. The evangelist urges his church to beware of internal factions and to reject false teaching. He seeks to strengthen the church community's resolution in the face of hostility and persecution from the Jewish leadership of the synagogue. It is now widely accepted that the discourses are concerned with the actual issues of the church and synagogue debate at the time when the Gospel was written."[1]:p.53 It is notable that, in the gospel, the community still appears to define itself primarily against Judaism, rather than as part of a wider Christian church. Lindars points out that Christianity started as a movement within Judaism, but he says that gradually Christians and Jews became bitterly opposed to one another...

Link: https://en.wikipedia.org/wiki/Book_of_John