Hi JohnIMmmmm,
Thank you for your inquiry!
The webpage Bat.bing.com is a host for Bing Ads Conversion tracking code. This webpage is owned by Microsoft and works directly with Bing Ads UET script. When a search user clicks on their Bing-powered ad and navigates to the advertiser’s web page, the script sends a beacon/signal to the Bat.Bing servers. The raw UET data is first analyzed in the Visitation pipeline to evaluate goals that are met.
I hope you found this information helpful. Please let me know if you have any additional questions as we are always happy to help.
Thank you for choosing Bing!
Sincerely,