When you visit certain annoying websites, as soon as they load, they display a full-page advert that blocks the content. And you usually have to click "Skip ad" or similar to get rid of it.
Is there a name for that kind of ad?
Clarification: I don't mean those banner ads that expand when you roll over them, partially obscuring page content... I mean the big ads that appear before you see any content, when you first open a web page, almost like a splash screen. Sometimes they disappear after a few seconds, and sometimes you have to click to skip past them.