What's the difference between "Paperback" and "Mass Market Paperback"?

I'm trying to buy a book off Amazon and it has these different formats. I'm caught between two, paperback and mass market paperback. What is the difference? If it means anything, I'm the type of person who, if faced between getting a paperback copy of a book or a hardcover copy, I'd take the... show more I'm trying to buy a book off Amazon and it has these different formats. I'm caught between two, paperback and mass market paperback. What is the difference? If it means anything, I'm the type of person who, if faced between getting a paperback copy of a book or a hardcover copy, I'd take the hardcover because, simply put, it's better. So what's the difference between these two, and which one's "better"?
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