For the optical disk authoring software, see Roxio Toast
In software engineering, a toast is a small, informational window displayed by certain kinds of software, especially instant messaging clients such as AOL Instant Messenger, Windows Live Messenger, XFire and Trillian. Toasts notify users of various kinds of events, such as reception of new e-mail, a change in a peer's availability, or a change in network connectivity.
Google adopted the concept of toast popup messages for user notifications as a basic component of its Android operating system. Microsoft also has adopted these notifications for its mobile operating systems, Windows Phone 7 & Windows Phone 8, as well as Windows 8.