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Small files are mainly used for website verification, such as Baidu Webmaster Tools or Google Search Console.
One common verification method is to upload a small text/HTML file to the root directory of your site.
After adding your site to Google Search Console, you will see an option to download an HTML verification file under the “Recommended verification methods” tab:
Once the file is uploaded, return to Google Search Console and click Verify.
Google will check the uploaded file on your server to confirm that you own the site.