Spiral
Soft cover or hard cover books bound with spiral coil can open flat and offer 360-degree rotation. Spiral coils are available in different colours and sizes. Best results with products not thinner than 6mm and not thicker than 24mm. 

Wire-o
Punched pages are inserted onto a C-shaped wire spine, which is squeezed until it is round. Like spiral binding it can open flat, it offers 360-degree rotation and wires are available in different colours and sizes. Best results with soft or hard cover books not thinner than 2mm and not thicker than 24mm.

Saddle-stitched
Most economical type of binding. Content pages and cover are stitched together with a metal wire, which is folded in the inside of the brochure and looks like a staple. 2 stitches is standard, but possible with more if requested.

https://www.printingcenterusa.com/blog/what-are-the-types-of-book-binding/