Twitter is releasing new ad units that are designed to help businesses improve their campaigns so that they result in more website clicks and sales. The new products include: Website Conversions Optimization, Dynamic Product Ads, Collection Ads, and Website Collections Ads. Twitter's new ads will be more effective in terms of conversions, as they will be targeted specifically at users who are more likely to be interested in the product. The ads will change dynamically to show products that are most relevant to the user at any given time. Twitter's new ad units, which include collection ads and dynamic product ads, are now available to all advertisers. Collection ads have been shown to increase click-through rates by an average of 42%, and increase conversions by impressions by 54%. For best results, Twitter recommends using their Pixel or Conversion API.
(source: https://www.searchenginejournal.com/twitter-rolls-out-3-new-ways-to-advertise/472446/)