Gospel means ‘good news’. It comes from the Greek word evanglion; hence the Gospel writers are called evangelists because they are proclaiming the Good News: the Good News that Jesus is the Messiah and came to show people a new way of living.
The bulk of the Gospel texts are concerned with the last three years of Jesus’ life, when he was teaching, and they also give much space to a description of his arrest, trial, death and resurrection.