This document discusses information architecture and its principles. It defines information architecture as "the structural design of shared information environments" and outlines several key principles of IA, including treating content as objects with lifecycles, providing meaningful choices to users, only disclosing enough information to help users understand what they'll find, using exemplars to describe categories, and assuming content will continue growing over time. The document emphasizes that information architecture is important because it makes information findable and usable, and is therefore a fundamental part of the user experience process.