The Knowledge Graph is Google's system for organizing information about millions of well-known "entities": people, places, and organizations in the real world. Google's algorithms merge information about entities from many data sources. For some types of information, though, the best source of data is the entity itself.

Specifically, companies and people can now customize their own data in the Knowledge Graph by adding structured data markup to their official website. The following types of data may be customized:

  • Logo
  • Social profile links
  • Company Contact number


Corporate Contacts

Use corporate contact markup on your official website to add your company's contact information to the Google Knowledge panel in some searches. Knowledge panels can prominently display your customer service phone number.

Get started quickly with these instructions for formatting and publishing the proper markup code if your company has service phone numbers that are national or global in scope.

Screenshots of customer service links





Source: 

Google.com