Keyword Universe Summary
Description
This dataset aggregates 18,578 keywords across 881 topic clusters into a summary by pillar. Each row identifies a cluster, its primary keyword, the number of keywords in that cluster, total search volume, median and maximum CPC, median keyword difficulty, AI Overview presence rate, People Also Ask rate and zero-volume share. It is intentionally a summary of internally derived clusters rather than a raw third-party keyword dump. The structure supports research on topical breadth, search demand, SERP features and keyword difficulty while avoiding redistribution of provider-level rows. A README provides the method, column definitions, CC BY 4.0 licence and citation line.
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Steps to reproduce
We grouped 18,578 keywords into 881 topic clusters and then summarized each cluster by pillar. Aggregates include keyword count, total search volume, median CPC, maximum CPC, median keyword difficulty, AI Overview share, People Also Ask share and zero-volume share. No raw third-party keyword rows are included.