The FLV video format is a open format that is used by both Adobe and third-party products. FLV files may be exported by Adobe Flash, as well as various other programs using the Flash Video Exporter plug-in. Since FLV is an open format, the files can be opened and played by several different media players.
About Adobe Flash
Flash is an authoring environment for creating animations and interactive experiences. Flash animations are commonly created for websites, but may also be saved as standalone videos that can be played in Flash Player. Flash supports both vector and raster graphics and can be scripted using the ActionScript programming language.