With perfect binding, pages are glued into the cover at the spine forming “perfect” edges. People love this method for its combination of good looks and low cost.
Another highly cost-effective way to bind a book is saddle stitching. This method stacks all the pages on top of one another then staples (usually) them together through the center fold.
Coil or spiral bound books bound by punching holes along the edges of the sheets, then winding a coil through them. If it sounds simple and inexpensive, you’re right. It’s quick, too.
GBC binding punches holes in the edge of the sheets before binding all the pages together with a simple plastic spine. Sometimes simple is best.
Like a tuxedo for books, hard binding provides an unmatched appearance. It also provides the best in protection, so your book last for many many years.