With remarketing in Bing Ads, you can serve ads on Bing and Yahoo search results to users who have visited your website. It’s similar to RLSA in AdWords, but the remarketing extends to product ads in Shopping campaigns as well.
You’ll need to have UET tags set up on your site to get started. Once that’s set, you create remarketing lists in the Audience section of the Shared Library in your Bing Ads account.
A list has to have at least 1,000 users in it in order to be used for remarketing.
Here is a video from Bing Ads on their YouTube channel to learn more about how to set up Bing Ads Remarketing: