This is the 7374th most frequent Japanese word.
付録
Supplement; Appendix; Attachment.
Here, '付録' is used to refer to a physical item (supplementary material) attached to a magazine, emphasizing its addition to the primary content.
この雑誌には、魅力的な付録が付いています。
This magazine includes an attractive supplement.
In this sentence, '付録' is used figuratively to denote additional material provided with a book, showcasing its inclusion as a part of the offering.
今回の本の付録として、小説の序章が掲載されています。
As a supplement for this book, the prologue of a novel has been included.
Here, '付録' is applied metaphorically to describe something accompanying or supplementing the main subject, such as additional content in media.