VoiceOver is a feature built into Apple Inc.'s Mac OS X operating system since version 10.4. By using VoiceOver, the user can access his or her Macintosh by using speech and the keyboard. The feature is designed to increase accessibility for those with impaired vision.
VoiceOver reads aloud the contents of files including web pages, Mail messages and word processing files, provides a comprehensive audible description of your workspace and includes a rich set of keyboard commands that allow you to navigate the Mac OS X interface and interact with application and system controls.