The Google Knowledge Graph is a knowledge base used by Google and its services to enhance its search engine's results with information gathered from a variety of sources. The information is presented to users in an infobox next to the search results. These infoboxes were added to Google's search engine in May 2012, starting in the United States, with international expansion by the end of the year. Google has referred to these infoboxes, which appear to the right (top on mobile) of search results, as "knowledge panels".