The document discusses how to build APIs that developers love. It emphasizes solving developer pain points by making APIs simple to use with predictable resources and common standards like REST and JSON. It also stresses the importance of thorough documentation with code samples, explorers, and multiple languages, as well as reliable and responsive support from API providers. Examples are given of successful APIs from companies like Netflix, Twitter, Foursquare, Stripe, and Twilio that exemplify these best practices.