The FLV (Flash Video) format is a multimedia container format developed by Adobe for streaming video over the internet. FLV files typically use the H.264 or VP6 video codec and the AAC or MP3 audio codec for compression. Once widely utilized for online video content, especially in conjunction with Adobe Flash Player, the FLV format has become less prevalent in recent years due to the decline of Flash technology and the rise of more modern and widely supported video formats like MP4 for online streaming.