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This information lets you find out the general target market of a technology, so for example you can find out what the biggest category for users of Twitter API is at the moment (it's entertainment). Or, who is the biggest segment of Optimizely Analytics (it's shopping and business) and who is the biggest customer base of Amazon CloudFront CDN technology (it's shops again).
BuiltWith Trends Pro users will soon have this category information added to their reports (for free) and also be able to purchase reports based on Technology+Category. At the moment these reports can be requested by sending us an email at firstname.lastname@example.org.