Stapled booklets, also called saddle stitched booklets are a very common way to inexpensively create bound booklets. This method is most commonly used on magazines, catalogues, multipage brochures, programs and instruction manuals.
Cerlox or spiral bound books are also a very common way to create a bound book. This type of binding allows easy flip-through and, with various sizes of bindings, larger page counts can be accommodated.
Perfect bound puts all the pages together with a flexible adhesive which attaches the paper cover to the spine. Paperback novels are an example of perfect binding.