A printed or digital booklet providing information for visitors, tourists, or users of a facility.
I got a free guidebook at the tourist information center in the station.
This museum guidebook describes the highlights of the exhibition in detail.
栞 in this sense is a small, often informal pamphlet handed out at events or sights, while 案内書 is a more general, formal term for any guidebook or manual.
案内書 is a more formal, often official written guide, while ガイドブック is the everyday loanword for a travel or how-to guidebook.
案内書 focuses on introducing or guiding someone to a place or facility, whereas 手引書 gives step-by-step how-to instructions.
Compound of 案内 (guidance, information) and 書 (document, book).