Please explain what is the google knowledge graph?

The knowledge graph is a knowledge base of facts that Google launched to enable searchers to get access to facts quickly.

The 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.

KG Shows all the data of organization , person , website on the left side of the serp

Knoweledge graph is the short data about the website which is found in right side of search engine