An appendix or supplement attached to a book or magazine — an extra section or bonus item separate from the main text.
今月号の雑誌の付録はエコバッグだった。
This month's magazine came with an eco-bag as a supplement.
本の最後に付録として詳細なデータが載っている。
Detailed data is included as an appendix at the end of the book.
付録の地図が旅行の計画に役立った。
The map in the supplement was helpful for planning the trip.