New Content
If you create and save a search, you can choose to be notified via email or just within the site, when new content is added that matches your search.
If you select the checkbox 'Get emails about new matching results' the email address you registered with will receive a notification every time something that would normally come up in the search results when this saved search is run is added to the system. You can choose to be notified for each and every record as it is added, or to receive a daily digest of new content.
You can always amend these settings using the Manage link that can be seen just above the list of your saved searches which appears when you click in the search bar.