A sitemap is an XML file that lists a site's URLs to help crawlers discover and index its pages. "Sitemap hygiene" means keeping that list accurate, current, and free of dead or duplicate entries.
In plain terms
A sitemap doesn't force indexing, but it helps crawlers find pages efficiently — especially new ones or pages that aren't well linked internally.
For example, adding a new glossary or blog section to your sitemap helps crawlers discover those pages sooner.
Good hygiene means the sitemap reflects only live, canonical URLs and is referenced from robots.txt.
Why it matters
A current sitemap helps compliant crawlers discover canonical URLs efficiently.
Discovery does not guarantee indexing or AI citation, but stale, redirected, or off-origin entries can make site inventory less reliable.