A sitemap is a file that organizes a site's pages into a list and gives it to search engines, helping them understand what content the site has and what is new. It does not directly determine rankings; its role is one step earlier—making the indexing process smoother and more complete.
Two types of sitemaps, with different purposes
For search engines. Page URLs are listed in an agreed markup format, usually along with information such as each page's last modified time and update frequency, for crawlers to read. This type of file is for machines; users generally will not open it.
For users. It is essentially an ordinary page that lists the site's main sections and pages in the form of links, making it easy for visitors to quickly understand the site structure and go directly to target pages. It provides an overview in addition to on-site navigation.
The two can coexist. For most sites, the one that truly needs maintenance is the former; whether to create the latter depends on site size—when there are not many pages, clear navigation is already enough.
How to generate and place it
When there is not much content, it can be organized manually; when there are many pages and updates are frequent, it is generally generated automatically by a content management system or with the help of tools. The file needs to be placed in an agreed location, or its address specified in the crawl rules file; otherwise, search engines may not actively read it. The addresses listed in it should be complete, accessible canonical URLs; if test addresses or links with temporary parameters appear, the corresponding pages are effectively not submitted.
How to get it discovered
- Submit it proactively in the webmaster tools provided by search engines, and at the same time check the indexing scale and changes.
- Specify the sitemap address in the site's crawl rules file, so crawlers read it while visiting.
- Large sites can be split into multiple sub-sitemaps, then listed together using an index file for easier management and updates.
A few common practices
List only public content pages with independent value. Backend pages that require login and filter pages with duplicate content are not suitable for inclusion. The file should keep pace with the content—update it in sync after new pages are published, old pages are taken down, or sections are adjusted, and the last modified times marked in it should match the actual changes to the pages. Time annotations that remain inaccurate for a long time will gradually lose their reference value.
A reminder
A sitemap is a "please come and look" list, not a guarantee of indexing. It points the way clearly, but whether pages are indexed ultimately still depends on the content itself.