Gospel is defined as the good news. In the New Testament times, gospel did not attribute to a book or manuscript, but to a proclamation or message. It was normally referred to as a proclamation of the good news. The good news usually consisted of a victory in battle or other news for the Romans. It also had an effect on the Hebrews by proclaiming the good news to them, especially of Israels victory over Gods victory. More broadly, it can proclaim all of Gods glorious acts over Israel. Jesus followers used gospel to describe the good news to the people, with extra effort that the good news involved what God did in Jesus.
However, some are not sure whether Jesus used gospels to spread his proclamation. Paul described the center of his gospel as Jesus suffering, death, and resurrection. Marks gospel opens with, The beginning of the gospel of Jesus Christ. He writes that all the good news through God will be put through Jesus Christ for all the nations to hear. His good word is put through human encounter for the real life to interact with and learn. It also involves that God is the almighty who makes Jesus the king over the real world. Matt and Luke do not begin their gospels the same way that Mark does, ut they all share the same ideas.
Matt shows Jesus proclaiming the kingdoms gospel and Luke describes activity through verbal use. The use of messages separates the gospel according to John from the others. The life of gospels beyond the canonical is a puzzling question. Very few uncanonical works are called gospels. However, gospel has been used to refer to uncanonical works independently of their self-identification. It may be better to keep two different categories because of the complications. One should be Jesus material and the other should be called gospels. This would make the distinctions much easier because akes the material easier to categorize.
The origin of a gospel genre arises from many early Christian writings both inside and outside of the standard known as the canon. Gospel is not used in the idea of the New Testament, and Matthew, Mark, Luke, and John did not put together part of the original writings. The idea of writings being referred as gospels probably came about in the 2d century and was established by the 4th century. Most of the writings outside of the canon were called gospels. Since these writings are uncanonical, the writings are perceived as fake and unimportant.
One can tell if a gospel is a gospel genre by the text type of the four canonical gospels. One should not use canonical vs. uncanonical as a norm for discussion of a gospel genre, however, there is much evidence to use the canonical gospel as text of a gospel genre. Although gospel is regularly defined as the good news, there are many ways of interpreting the good news and to whom the it is relevant. More complex, the idea of a gospel vs. a gospel genre is another confusing idea, however, both of these ideas are simplified by making easier categories and understanding all angles of a gospel.