Many content managed site have a site-search feature for users to search the entire site content for particular keywords. The functionality is already built-in Drupal. You just have to enable it. To enable Drupal's site-wide search functionality....

1. Go to "Administer -> Modules" and checkmark to enable the Search module. Click "Save Configuration".

2. Then in "Administer -> Site Building -> Themes", click the "Configure" link for your theme. And checkmark "Search box" under toggle display section. Click "Save Configuration".

3. In "Administer -> Site Building -> Blocks", find the "Search form" block and set its region to "Right sidebar" or your choosing.

Click "Save blocks". Then click the "configure" link for that block for further configuration.

4. In "Administer -> Permissions -> Search Modules", checkmark the appropriate boxes to allow user to use search. Typically for "search content", I would checkmark "anonymous user", "authenticated user", and "administrator". For "administrator search" and "use advanced search", I would only checkmark "administrator".

5. You can configure your search settings and see what percentage of the site has been indexed by "Administer -> Search Settings".

5.  You can configure your search settings and see what percentage of the site has been indexed by "Administer -> Search Settings".