A site map (or sitemap) is a list of pages of a web site accessible to crawlers or users. It can be either a document in any form used as a planning tool for Web design, or a Web page that lists the pages on a Web site, typically organized in hierarchical fashion.

Learn about sitemaps

The Purpose of Site Maps and Other Design Deliverables
UX Matters

Sitemaps - The Beginner's Guide
The UX Review

Is the Sitemap Losing Its Client-Facing Steam?
UX Magazine