The default Windows XP (Luna theme) display of a determinate progress bar

Example of indeterminate progress bar when searching in Windows XP (Energy blue theme)

Image:Progbarr.png Image File history File links Exampleprogressbar. ... Image File history File links Exampleprogressbar. ... Windows XP is a line of operating systems developed by Microsoft for use on general-purpose computer systems, including home and business desktops, notebook computers, and media centers. ... Image File history File links Progbarr. ... Image File history File links Progbarr. ... Windows XP is a line of operating systems developed by Microsoft for use on general-purpose computer systems, including home and business desktops, notebook computers, and media centers. ...

An example of an indeterminate progress bar in Mac OS X

A progress bar is a component in a graphical user interface used to convey the progress of a task, such as a download or file transfer. Often, the graphic is accompanied by a textual representation of the progress in a percent format. Image File history File links MacOSXProgressBar. ... Image File history File links MacOSXProgressBar. ... This article or section needs a complete rewrite for the reasons listed on the talk page. ...

A more recent development is the indeterminate progress bar, which is used in situations where the extent of the task is unknown or the progress of the task can not be determined in a way that could be expressed as a percentage. This bar uses motion or some other indicator to show that progress is taking place, rather than using the size of the filled portion to show the total amount of progress.