A line drawing or diagram can convey a concept very clearly and can be created especially to promote your product.

For example, the window illustration at top right is one of several to ensure that the customer understands what the supplier means by a "casement" window, or sash, or hopper, etc.

The diagram at lower right is also one of several and shows how to get the needed dimesions in case "A."

The illustration below is an animation which show the plans of a proposed site development.

Another application of an animated diagram shows the assembly of a theatre set.