Nagware is a description of any software that displays a popup, notification, or window, nagging the user to perform a task or try a feature. For example, shareware or another program could display a nag message when the program loads telling the user to register the software or purchase a license. More annoying nagware may even display messages at random times while the program is open.
Well-designed software has a checkbox or link that can be clicked to prevent nag messages or only display the nag messages when the program is running. However, some programs may install software that allows it to load up each time the computer boots and run in the background so its nag messages can be shown at any time.
If nag messages cannot be disabled or cause too many distractions, we recommend uninstalling the program.