Bindery is a catch all term to describe various stages in production that the print product goes through after the initial printing is complete. Bindery is a post-print process that is also known as "finishing" because these steps are almost always the last steps before the product is complete.
Trimming
Scoring
Folding
Die cutting (custom shape)
Mounting
Embossing / Debossing
Saddle-stitching (stapling)
Glueing