>Maybe I’m reinventing the wheel, but I did not know the answer to my question and I thought it might be good idea to spread the news.
I copy and paste the following information:
A Paperback is simply a book that has a glued spine and a paper or cardstock outer cover (called "wraps" or "wrapper"). In contrast, a hardback (until recently) would have a sewn binding and a cloth or paper covered "board" cover.
A Mass Market Paperback (MMPB) is the relatively small "pocket-sized" book that fits in a rack designed specifically for such books. These began in the 1930s and are the cheapest way to get a book out on the market. These are distributed the same way newspapers and magazines are. Typically the paper is of poor quality, readily yellowing over time. These books show up in regular book stores but also in nontraditional spots such as airports, drugstores, and magazine stands.
A Trade Paperback is a larger book, often the same size as the hardback original. Typically the paper is of better quality than in the MMPB. Sometimes, even the text on the pages is exactly the same as that of the hardback copy, especially if put out by the same publishing house. Their price is higher than that of an MMPB but less than a hardback.
An Oversized Paperback is also a Trade Paperback, simply a larger format book with a soft binding. Often the hardback edition is also an oversized book. There are specific terms booksellers have traditionally used to tell you the size of a book, such as quarto or folio, but many book buyers are not familiar with these terms today. This is why booksellers often include either the dimensions of a book or they state "oversized" in the description of the book.
An Academic Paperback is one released by a university press and which may have a cover made of heavy paper, not the glossy cardstock seen in MMPBs and most Trade Paperbacks. Traditionally, many buyers of these books would have them custom-bound if they intended to keep them for a long time.
Source: Askville by Amazon