XML Feeds
XML Feeds are a form of Paid Inclusion in which search engines are given information about a website or some of its pages using XML, as opposed to using their spider to crawl through actual pages of the Internet.
Marketers pay to have their pages included in the search engine index. Fees are calculated on an annual basis per URL or on a CPC basis for each XML document (usually one page on the site).
Paid inclusion today includes traditional text webpages, and video, graphic images, and rich media.

