Macromedia Flash is a software program used to create animations and interactive content. It has a title bar, menu bar, toolbar, toolbox, timeline, and panels. The toolbox contains tools for drawing, editing, and working with layers, symbols, buttons, and movies. The timeline displays layers and controls the playback of movies. Panels provide options to modify characters, windows, and panel layouts. Movie files are saved with the .fla extension and can be created, opened, saved, and closed.