Google's Knowledge Panel is a SERP feature that appears above the organic search results on mobile and to the right on desktop and provides additional information about the topic of the search query. The Knowledge Panel can include a brief description of the topic together with factoids, images, links to related search topics, reviews, Google posts and more. The source for the information presented in the Knowledge Panel is Google's Knowledge Graph (a semantic-information database).
Comprehensive guide to Knowledge Panel
Comprehensive guide to mobile Knowledge Panel