| user engagement | Noun. Any action a visitor takes on a Web page, including but not necessarily limited to: leaving a comment, clicking on a link, filling out a form, using a widget (such as a calculator), activating a social share, etc. Search engines DO NOT measure user engagement. |
| crawling | The process by which search engines discover your web pages. |
| geographic modifiers | Terms that describe a physical location or service area. For example, pizza is not geo-modified, but pizza in Seattle is. |
| link firewall | Noun phrase. Any page that prevents well-behaved crawlers from following its links to other pages (the other pages should be completely isolated from well-behaved crawling). |
| portal | A portal is a web service that offers features to entice a user into making that portal as their homepage. Think of Yahoo! and MSN as good examples of portals. |
