Under Interactive event we have five different actions:
Redirect
Wait seconds
Show element
Hide element
Toggle show/hide

Redirect will redirect the user to another page of your choosing.
Wait seconds will make the user wait up to 5 seconds, this is normally paired with another action like Redirect.
Show element will show a previously hidden element, this is great to use when creating pop-ups.
Hide element will hide a previously shown element, again great to use when creating pop-ups.
Toggle show/hide will toggle an element between show and hide, you can use this, for example, on user tooltips, more information card pop-ups, etc.