Google is building the largest warehouse of knowledge in human history – and it’s doing it with your help.

Authoritative sites such as Wikipedia, CIA World Factbook, and Freebase are all sources used by Google to gather data about people, events, animals, events, history, and topics.

Google algorithm updates – including Panda, Penguin, Pigeon, and Hummingbird – aren’t designed to destroy your site rankings, but to help realize Google’s goal: to build a knowledge databank that people can access easily through the search engine wherever they may be.

Read more in http://neilpatel.com/2015/06/30/the-beginners-guide-to-the-googles-knowledge-graph/