While carousels are traditionally seen as a good way to squeeze more content into a limited amount of screen space, studies (see Should I Use a Carousel?) show that site visitors are most likely to ignore anything beyond the first slide, and a poorly built carousel can irritate users, leaving them with negative feelings towards your site and your organization.
More information is available on the image carousels page of the Georgia Tech Resources for Webmasters website, but in short, for the time being it's best to avoid carousels whenever possible, especially with Drupal sites.
If you inherit any Drupal sites, you may see the GT Slideshow or GT Carousel Slider module on them. These modules are deprecated and no longer supported, so you should remove them from your site(s) as soon as possible.