Click Share, is the number of monthly estimated clicks divided by paid clicks for competitors and other sites relevant to your service or industry receive. It is also a critical audit factor. Click Share reveals the opportunities for your business on a Search Engine Results Page (SERP).
Determining Click Share will help us highlight threats in the marketplace; including things like Google’s Knowledge Graph.
Knowledge Graphs show information directly within the Search Engine Results Page, instead of as a listing. Below is an example of a Google Knowledge Graph for Strep Throat. Knowledge panels or graphs typically show up on pages that do not serve ads. Presumably, this is so users can move on to their next search, where Google will feature an ad.