echo is a command in Unix (and by extension, its descendants, such as Linux) and MS-DOS that places a string on the terminal. It is typically used in shell scripts and batch programs to output status text.
Echo provides a high level of abstraction between the development of a Web-based user interface and the requirements of the browser environment.
Echo provides a basic array of built-in components to cover the fundamental concepts of user interfaces, such as windows, labels, buttons, text entry areas, listboxes, and tables.
Echo provides numerous components whose purpose is to lay out the user interface of an application, such as defining the positioning and order of other components.
In computing, an echo is the printing or display of characters (a) as they are entered from an input device, (b) as instructions are executed, or (c) as retransmitted characters received from a remote terminal.
In computer graphics, an echo is the immediate notification of the current values provided by an input device to the operator at the display console.
Echo was an Oread who had the job of talking incessantly to Hera, the Queen of the Gods, so that her husband, Zeus, wouldn't get caught in his numerous affairs.
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