Time was that you needed to pay to ensure that your pages were indexed. But Skinflints want that for free. Enter Sitemaps, which offers most of the benefits of the old paid inclusion without spending a dime. You can provide a file that lists your URLs and helps the crawler find your pages.
Sitemaps, pioneered by Google but now adopted by Yahoo! and Microsoft too, provides several different formats for the URL lists, including a flat file with one URL per line. Some programs can generate the file for you—and some of the fancier file formats allow you to denote which pages have the highest priority to be included whenever they change. All in all, Sitemaps is a very nice way for Webmasters to exert some control over indexing.
So it's nice that Sitemaps is free, but there are a number of drawbacks:
Remember, pages missing from search indexes means searchers miss your site. Sitemaps is a free way to increase your included pages.
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