What is file with suffix .FLV?

This file suffix .FLV is mostly associated with those descriptions:

> Flash.VideoFile (10%)
> totalplayer.file (7%)
> FLV File (2%)
> VP6 Flash Video (2%)
> KLCP FLV File (2%)
> Flash Video (20%)
> BSPlayerFile.FLV (3%)
> KMP -Video File (2%)
> Flash Video File (16%)
> FlashVideo.FlashVideo (2%)
> FLV Video (4%)
> VLC media file (.flv) (3%)
> GOM Media file(.flv) (2%)
> flv_auto_file (5%)