What is carousel post?
Also called: swipe post
Carousel post
A single Instagram post containing up to twenty images or videos that a viewer swipes through.
Carousels tend to outperform single images on engagement for a mechanical reason: each swipe is time spent, and a viewer who does not engage on the first card may be re-served the post starting from a later one.
The cost is production effort, which is why carousel-heavy accounts usually post less often.