What is the over all setting of the story The Canterbury Tales?Why in chapter 5 does Chaucer discuss how they are portrayed?

The prologue gives a basic set up of the
story.

General setting: the journey of 30 travelers from a
small tavern (in a town near London) to Canterbury.  The travelers are going to pay
tribute to the shrine of St. Thomas aBecket.  Along the way it is suggested that to pass
time on the journey, each should tell a story.  At the end of the journey, the best
story will be chosen.

Characters: the narrator goes on to
give a glimpse of each of these travelers who will be on the journey.  This first
description is brief and based largely on appearance and a few actions.  Follow the link
for a more in-depth list.