A paperback book is a popular format that's convenient to carry and read. But did you know that there are other synonyms for the word paperback? Some of the most common are softcover, trade paperback, and mass-market paperback. A softcover book typically has a pliable cover that's made of thin cardboard or paper, while a trade paperback is a larger format that's often used for non-fiction works. Mass-market paperbacks are smaller in size and printed on cheaper paper to make them more affordable. Whatever format you prefer, the paperback book remains a popular choice for avid readers who enjoy taking their books with them wherever they go.