For wire and spiral binding, the book block is first trimmed on all four sides. Then, holes are drilled along one side and the pages are secured by either a wire that is clamped through the holes or a spiral that is threaded through the holes.
Because wire and spiral bound projects do not have to be stapled or sewn through the fold, they do not follow the standard page count multiple of 4 rule. Instead your final page count can be an increment of 2.
Wire and spiral binding is most often used for calendars, cookbooks, and activity/workbooks.