noun
Refers to a paperback book, as opposed to a hardcover. Common in bookstores and publishing contexts.
この小説はペーパーバックで買った。
I bought this novel in paperback.
文庫本 is a small-format Japanese paperback, often a reprint, while ペーパーバック typically refers to a Western-style paperback.
Loanword from English 'paperback'.