One of the most popular ad formats in Facebook Ads is the carousel. It consists of a hook, 2 to 10 photo inserts, an additional description and a call to action button. No matter how many inserts you choose to use, a mobile user will have to scroll to the right to view your second and subsequent inserts. It is therefore an ideal format for presenting a service or products that require a lot of information.
Each insert has its own description which gives more information than on a static advertisement. More concretely, this format is widely used by e-commerce sites, multi-stage contests and product presentations.