A `sitemap.xml` is an XML file that helps search engines understand the structure of your website. It provides a list of URLs for your site, along with additional information about each URL, such as how often it is updated and its importance relative to other URLs on your site.
Here is a simple example of a `sitemap.xml` structure:
```xml
http://www.example.com/
2023-10-01
monthly
1.0
http://www.example.com/about
2023-10-01
yearly
0.5
http://www.example.com/contact
2023-10-01
yearly
0.5
```
In this example:
- <url>: Defines a URL entry.
- <loc>: Specifies the URL of the page.
- <lastmod>: Indicates the last modification date of the URL.
- <changefreq>: Suggests how often the content at the URL is likely to change.
- <priority>: Indicates the priority of the URL relative to other URLs on the site (scale from 0.0 to 1.0).
Having a well-structured `sitemap.xml` can improve your site's SEO by making it easier for search engines to crawl and index your pages.