A `sitemap.xml` file is an XML file that provides search engines with information about the pages, videos, and other files on your site, as well as the relationships between them. Here’s a basic structure of a `sitemap.xml` file:
```xml
http://www.example.com/
2023-10-01
daily
1.0
http://www.example.com/about
2023-09-15
monthly
0.8
http://www.example.com/contact
2023-08-20
yearly
0.5
```
Key elements in the `sitemap.xml` include:
- <url>: Defines a URL entry.
- <loc>: The location of the page.
- <lastmod>: The date the page was last modified.
- <changefreq>: How frequently the page is likely to change (e.g., daily, weekly, monthly).
- <priority>: The priority of the page relative to other pages on the site, on a scale from 0.0 to 1.0.
Using a `sitemap.xml` helps search engines crawl your site more effectively, improving visibility and indexing.