Sitemap
A list of your page URLs meant for search engines. Useful, but solves nothing on its own.
Why it matters when you read an offer
Often listed in offers as a separate service. It takes minutes to create, most platforms generate it automatically, and its presence is not evidence of work done.
What it looks like in an offer
Creating and submitting a sitemap as a separately billed service. It is a standard part of any build, not an extra.