What is Difference Between Featured Image and Listing Logo ?

Listing Logo:

Listing Logo will show on your listing detail page as a logo. And you can upload it from the submit listing page.

Listing Logo is only shown on Listings / Restaurants Listing Types Detail pages

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Featured Image:

Featured Image will show on the listing as a listing image. In the search result page, listings will with their image is called a feature image. And you can upload from the submit listing page and will be displayed on the homepage if you are using ET Listings Element.