ActionScript is an object-oriented programming language originally developed by Macromedia Inc. (later acquired by Adobe Systems). It is a derivation of HyperTalk, the scripting language for HyperCard.
ActionScript is an object-oriented programming (OOP) language that is designed specifically for Web site animation. Originally released with Macromedia Flash 4 and enhanced for Flash 5, ActionScript is a sophisticated version of the script language introduced in Flash 3.
ActionScript makes it possible for developers to create onscreen environments (such as games, tutorials, and e-commerce applications) that can respond to user input through the keyboard or mouse. ActionScript is an event-based language: just as is the case in real life, actions are triggered by events.