All the presets for web destinations default to an MP4 format that consists of an MPEG-4 AVC (H.264 AAC) file coupled with a Flash player. That means you get HD-quality; the smallest file size possible; and ubiquitous playback, on any platform, within any Flash-enabled browser.

Two other formats—FLV and SWF—also play in any browser with Adobe Flash Player and are available for those who need them.