Macromedia Flash (SWF) uses techniques such as bit-packing and structures with optional fields, to minimize file size.

SWF is a binary format and is not human readable like HTML. The files are compressed to be small and support incremental rendering through streaming. Network Delivery-The files can be delivered over a network with limited and unpredictable bandwidth.Extensibility-The format is a tagged format, so the format can be evolved with new features while maintaining backward compatibility with older players.On-screen Display-The format is primarily intended for on-screen display and so it supports anti-aliasing, fast rendering to a bitmap of any color format, animation and interactive buttons.It was designed to meet the following goals: The Macromedia Flash File Format (swf) was designed as a very efficient delivery format and not as a format for exchanging graphics between graphics editors.

The Macromedia Flash (swf) (pronounced 'swiff' ) file format was designed to deliver vector graphics and animation over the Internet. ShockWave Flash, Animated Vector Format for Internet. The swf file extension is associated with Adobe (formerly Macromedia) Flash movie file.

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