... information architecture is the creation of a structure for a website, application, or other project, that allows us to understand where we are as users, and where the information we want is in relation to our position. Information architecture results in the creation of site maps, hierarchies, categorizations, navigation, and metadata. Information architecture is a task often shared by designers, developers, and content strategists. But regardless of who takes on the task, IA is a field of its own, with influences, tools, and resources that are worth investigation. In this article we’ll discuss what information architecture really is, and why it’s a valuable aspect of the user experience process.

http://www.uxbooth.com/articles/complete-beginners-guide-to-information-architecture/