A flash movie, or shock wave file (SWF), is the file format published when a Flash movie is exported. A SWF file can also be exported by several other Macromedia or Adobe Products. The SWF is usually an animation, dynamic menu, or highly interactive web-based application embedded into an HTML page. Flash files, when exported correctly for the best web-based optimization, are compressed, thus making their file size lightweight.

The SWF format is ideal for presenting vector-based, interactive and animated graphics with sound and video for the web. Vector images are ideal because they will not “pixilize” if stretched or compressed. Flash files can also contain text which can be animated, static or dynamically populated from external sources, such an XML file or a database. Text embedded in a Flash file, for many years, could not be read by search engines. However, recent updates by Macromedia are making this a possibility.