The Bing Visual Search API returns insights for an image. You can either upload an image or provide a URL to one. Insights are visually similar images, shopping sources, webpages that include the image, and more. Insights returned by the Bing Visual Search API are similar to ones shown on Bing.com/images.
If you use the Bing Image Search API, you can use insight tokens from that API's search results for your Bing Visual Search instead of uploading an image.
If you get image insights using the Bing Image Search API, consider switching to the Bing Visual Search API, which provides more comprehensive insights.
Source: Azure Documentation