The Google Knowledge Graph was first introduced in 2012. Since then it has diversified in the types of data presented and it has greatly expanded in usage.

The Knowledge Graph can sound really intimidating, but it doesn't have to be. It is simply a huge collection of the people, places, and things. What's important is that Google's Knowledge Graph understands how those people, places, and things are connected to one another and it's changing the way search results are presented.

1
Introduction to Google’s Knowledge Graph
2
Ranking in the Knowledge Graph
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Knowledge Graph Concepts
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Knowledge Panel
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Knowledge Box (Answer Box)
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Featured Snippets
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Rich Cards
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Carousels
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Structured Data