Saddle stitch is when single sheets of paper are printed on both sides, collated in page number order, folded in half and then stapled through the fold by a saddle stitch stapler. Saddle stitch binding is one of the most common binding methods for booklet manufacturing

Binding  a notebook or booklet, in which the pages are fastened together by a spiral of wire or plastic that coils through a series of holes punched along one side of each page and the front and back covers.

Wire–O Binding, also known as Twin Loop, Double-Loop, Double-O, Duo-Wire, or simply Wire Binding, is a popular method for joining the pages and cover of a bound document. … The Wire–O binding method utilizes pre-formed pairs of wire loops that run along a C-shaped unit.

Perfect binding is a popular type of book binding you see on soft cover books such as paperback books and magazines. The internal pages are printed on both sides of text weight paper, then gathered together (collated) into a book, one on top of the other, in numbered page order.