catalog is a bound book or booklet show products
brochure - a pamphlet that has more information about a product, event, or service than a catalog has.
leaflet is a single sheet printed on one or both sides and often folded
insert - loose ad inserted into an newspaper or mag.
pamphlet - usually not bound. Can be a leaflet or multiple pages
flyers - are leaflets that are handed out instead of mailed or inserted.
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