A slider is a nice effect for rotating a series of transitioning images, pages or files, on your web pages.
An image slider rotates a series images.
When you click on an image it opens up in a lightbox.
If you have included a page URL in Image Settings area, clicking on the image will open this page URL rather than opening the lightbox.
There is no text on top of the image, though depending on the animation it might display the image summary description.
A page slider rotates a series pages.
The slide will slide the full page, so it will effectively slide any content you.
This can be used for anything from sliding text content, background images with text on top.
Use cases might include web-presentations online rather than using Keynote or Powerpoint. It could be to describe your business processes. Or, just a more advanced image slider that allows you to position text in different positions for each background image.
It is super important that you set both the widget 'Height' and the row 'Height' to the same height e.g. 600px. This will ensure that each slide is the same height.