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.

Sitemaps XML
The Purpose of Site Maps and Other Design DeliverablesUX MattersJanuary 25th, 2016
Sitemaps – The Beginner’s GuideThe UX ReviewApril 19th, 2013
Is the Sitemap Losing Its Client-Facing Steam?UX MagazineDecember 22nd, 2010