A window that appears on top of all other Windows. This term became a well-known term with the advent of intrusive and non-intrusive Internet pop-up ads. These ads became increasingly annoying as this form of advertising started to become popular with many web pages.

Advertisement, Internet, Internet terms, Pop-under

  • How to allow or block pop-up ads in a browser.
  • How to allow pop-ups in Chrome.
  • How to prevent Messenger pop-ups.