What Will The Placeholder Definition Control?

The placeholder is little more than a tag that is meant to define an area on the page where the content is shown. The placeholder definition lists which region definitions (and their associated region templates) and which subtemplates are available to pass information through.

You can also control other details on a placeholder-by-placeholder basis through the placeholder definition. Some of these items include workflow, whether the contributor can edit the data displayed through the placeholder, whether the contributor can edit the metadata, ability to view Web site usage reports, and the ability to view content tracker reports.