Popup is a term used to describe a window that appears on top of all other Windows.

This term became a well-known term with the invention of Internet pop-up ads. These ads became increasingly annoying as this form of advertising started to become popular with many web pages.

By default, Google Chrome blocks pop-ups from automatically showing up on your screen.  When a pop-up is blocked, the address bar will be marked Pop-up blocked.  You can also decide to allow pop-ups.

If you still get pop-ups after disabling them:

• You may have previously subscribed to receive notifications from a site. You can block notifications if you don’t want any communications from a site to show up on your screen. 

• Your computer or phone may be infected by malware.