Click the categories to zoom in and see the subcategories underneath it. The size of each box represents how busy the category is (how many titles were published in the last 30 days). When you’ve zoomed in, click the up arrow to go back. If you hover over a subcategory, you’ll get a pop-up link to the Top 100 in the store.
The Kindle Store has thousands of categories, and it’s hard to make sense of them all if you’re a self-published author. I’ve crawled all 4000+ categories and made them available for download here.
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