A digital file format that holds audio, video and subtitles. Containers support a variety of audio and video compression methods and are not tied to one particular audio or video codec. AVI was the first Windows container format, and Matroska/MKV is a popular open source container. MPEG-4, QuickTime and RealMedia are also A/V containers. See codec examples.
Additionally, LifeCache ADM supports a wide range of multimedia containers, codecs and a flexible set of delivery mechanisms including HTTP Progressive Download, RTSP/RTMP streaming and HTTP Live Streaming (iPhone/iPad).