The name given to the web crawler that Google uses to crawl web pages in order to analyze the content so Google AdSense can serve contextually relevant advertising to the page.

Mediabot visits those pages running Google AdSense ads which have not blocked its access via a robots.txt file and it's a Google recommendation that webmasters specifically add a command to their robots.txt file granting Mediabot access to the entire site.

The Mediabot revisits pages on a regular, but unpredictable basis and any changes made on a page may not immediately result in changes to the ads displayed on the page.

Ads can still be shown on a page even if the Mediabot has not yet scanned it; therefore, the ads chosen will be based on the overall theme of the other pages on the site. If no ads can be chosen, public service announcements may be displayed or blank areas might result.