Paperback refers to a kind of book binding by which paper pages are bound together with a thick paper cover, unlike a hardcover.
Paperbacks include cheap mass market paperbacks, in the standard "pocketbook" format generally printed on newsprint or other low quality paper and more expensive trade paperbacks in larger formats printed on better quality paper. Many RPGs use a magazine-sized book in paperback format.
A friendly reminder regarding spoilers! At present the expanded Trek universe is in a period of major upheaval with the continuations of Discovery and Prodigy, the advent of new eras in gaming with the Star Trek Adventures RPG, Star Trek: Infinite and Star Trek Online, as well as other post-57th Anniversary publications such as the ongoing IDW Star Trek comic and spin-off Star Trek: Defiant. Therefore, please be courteous to other users who may not be aware of current developments by using the {{spoiler}}, {{spoilers}} OR {{majorspoiler}} tags when adding new information from sources less than six months old (even if it is minor info). Also, please do not include details in the summary bar when editing pages and do not anticipate making additions relating to sources not yet in release. THANK YOU
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