Templates are useful starting points for standard documents because you can preset them with layout, graphics, and text. For example, if you prepare a monthly magazine, you can create a template that contains the layout of a typical issue, including ruler guides, grids, master pages, placeholder frames, layers, and any standard graphics or text. That way you can simply open the template each month and import new content.
You create a template the same way you create a regular document; the only difference occurs when you save the document. When you prepare a template for others to use, you may want to add a layer containing instructions about the template; hide or delete the layer before printing the document.