Large sites may have many different sections or types of pages. Each section of the site or type of page may have its own unique look. A Frequently Asked Questions page may have distinct areas for a question, an answer, and links to further resources, while a product page may have a picture, a product description, and ordering information. You could create different templates for each type of page, but even that may be more work than necessary.
While many pages in a site may have subtle differences, they usually share very basic design features. The overall structure of every page, for example, may be the same: same logo, banner, and navigation bar. Even the basic layout may be the same. And there lies the problem with creating individual templates for each section: if you need to make a very basic site-wide change, like adding a new button to the site's overall navigation system or altering the banner, you need to edit each template individually, adding extra time, effort, and risk of making a mistake.
Fortunately, Dreamweaver offers a tool to solve just this problem: nested templates. A nested template is a template you make from another template, which then becomes the master template (see Figure 17-13).
Figure 17-13. Nested Templates (middle row) let you build templates that share common site-wide design elements while providing precise control for particular types ...