The accordian fold is used for brochures or as an alternative to the tri-fold. 4 or more panels are folded back and forth alternatively to form a W shape.
The simplest type of fold commonly used for covers and simple four page brochures.
This fold is commonly used in brochures. One panel is folded inward at one end and then folded inward again one or more times. It is as if you are rolling the piece up.
A fold where a three panel piece has both side sections folded inward, one on top of the other. Each panel is approximately 1/3 of the the width. Also known as a C-Fold or letter-fold.
A fold represented by back and forth folds into 3 panels forming a Z shape. This fold is similar to the accordian fold, the only difference being the amount of panels being folded.

This method of folding paper is where each fold is made at a right angle to the previous fold. Right-angle folds are usually used when creating signatures for a magazine or catalog from a single printed sheet. The folded edges are then cut to create pages. Also known as a French Fold

This type of fold is where the piece is folded in half and then folded in half again, with the folds being parallel to eachother. Also known as a quarter fold.
With a Gate Fold the left and right edges fold inward with parallel folds and meet in the middle of the page without overlapping.
This fold is the same as the Gate Fold, but the paper is folded again down the middle so that the folded edges meet and a fold is created in center panel of the paper.