Binding:

sewn with wire "stitching"

folded sheets (4 sides each) connected with wire staples, optional staples can have eyelets to put the catalog in a binder.
the ridge has a half-round shape
used for publications up to 80 pages (depending on the thickness of the paper)


glued so-called "paperback"

individual sheets with the cover are joined with hot glue
the ridge has a rectangular shape
used for publications over 40 pages


hardback

folded sheets (2 sides) combined with PUR glue and a hard cardboard cover
the ridge has a rectangular shape
used for publications over 100 pages