MPEG-4 Part 14 or MP4 (formally ISO/IEC 14496-14:2003) is a multimedia container format standard specified as a part of MPEG-4. It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. A separate hint track is used to include streaming information in the file. The only official filename extension for MPEG-4 Part 14 files is .mp4.
Some devices advertised as "MP4 Players" are simply MP3 Players that also play AMV video or some other video format, and do not necessarily play the MPEG-4 part 14 format.
Read more about MPEG-4 Part 14: History of MP4, Filename Extensions, Data Streams, Metadata
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“In the latter part of the seventeenth century, according to the historian of Dunstable, “Towns were directed to erect ‘a cage’ near the meeting-house, and in this all offenders against the sanctity of the Sabbath were confined.” Society has relaxed a little from its strictness, one would say, but I presume that there is not less religion than formerly. If the ligature is found to be loosened in one part, it is only drawn the tighter in another.”
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