Alert box is a dialog box that appears on window with some message and stays rigid until the event associated with it is not done. Alert Box is also referred to as pop-up window.
Among these two words Alert & box, Alert is a class defined inside the mx.controls package. The pop-up window appears when .show() method of Alert class is called. Programmer can write its message inside the method parenthesis, method displays programmers message as string on the opened pop-up window that contains a string title 'Alert'.
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