Securing loose printed pages in a soft or hard-covered book with rings that hold the pages through holes punched in the pages is ring binding.
3-ring binders (think school days) are common but binders may have any number of rings. A single ring is also a form of ring binding. Covers are less common. Single sheets of paper or cards (often laminated) are punched with a single hole, usually in a top corner, then put on a ring that snaps open and closed.
Ring binders come in many thicknesses and colors, can be imprinted or embossed, may be plastic, heavy paper or board, leather or fabric covered, and include pockets for inserting loose documents.
See Ring Binding is Good for Frequently Updated Publications for additional tips.


