This document discusses Flickr's APIs and feeds. It explains that APIs allow developers to build applications that interact with Flickr's data and services, empowering developers and making Flickr a platform. Feeds provide a simpler way to access Flickr data than push technologies like Comet, and allow for asynchronous access by various consumers. The document considers questions around authentication, support for different programming languages and formats, and ways Flickr could improve or expand its APIs and features.