Simply installing a plugin is not all you must do. You must still make changes in your site's templates to take advantage of the new features.
Every plugin will be somewhat unique in the features and functionality it provides. Some plugins may be quite complex, and others will be relatively simple. But the vast majority of plugins work with templates in some form or another. Most add new properties that can be used with the templates.
When a new plugin is released, the changes the plugin makes to the template language will also be made available in this section. As an example, we will use the polls plugin as an example of how this all works.