The document discusses new search APIs in iOS 9 that allow apps to submit their data to Spotlight for indexing and discovery. There are three APIs - NSUserActivity, Core Spotlight, and WebLinks - that allow apps to index user states, app data like Core Data objects, and web content to surface relevant search results within apps and for uninstalled apps. The document provides an overview of how each API works and encourages using them to improve discoverability, engagement, and search ranking.
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