The term "Synoptic Gospels" refers to three of the four Christian gospel accounts found in the New Testament - Matthew, Mark and Luke. These three gospels are considered synoptic because they share a large amount of common material when compared with each other. The word 'synoptic' comes from the Greek word meaning "seen together," indicating that these gospels present similar stories and teachings of Jesus Christ.
The Synoptic Gospels often follow a similar narrative structure, beginning with the baptism of Jesus by John the Baptist, followed by his ministry in Galilee, then Judea, and finally ending with his crucifixion, resurrection, and post-resurrection appearances. The three gospels also share many of the same parables, miracles, and sayings attributed to Jesus.
The fourth Gospel - John's account - is considered non-synoptic because it presents a different perspective on the life and teachings of Christ than the Synoptics. While there are some similarities between the four gospels, they each offer unique insights into the person and work of Jesus Christ.