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File extension	.3gp
Category	Video File
Description	3GP is a file format designed for video on mobile phones. 3GP is a container that facilitates the creation, editing, transfer and viewing of video and audio using a 3G mobile phone. It is supported by most smartphones, including the Apple iPhone.
Actions	3GP Converter View other video file formats
Technical Details	3GP is based on the structure of MPEG-4 Part 14, otherwise known as MP4. 3GP was designed to reduce the overhead in terms of storage and bandwidth to allow video files that could be handled by smartphones.
Associated programs	QuickTime Player VLC Media Player Windows Media Player
Developed by	3rd Generation Partnership Project (3GPP)
MIME type	video/3gpp audio/3gpp
Useful links	More Information on 3GP Official Specification from 3GPP Organisation

File extension	.aac
Category	Audio File
Description	AAC is similar to MP3. It essentially cuts out, or compresses, information that the human ear cannot pick up thereby making digital files smaller and more easily managed and therefore quicker to download. AAC is about half the size of MP3 but with better quality. It is at least one tenth the size of CD digital data. Apple are the biggest users of this format and if you have an iPod or iPhone then you will have come across this format as it is iTunes default audio format.
Actions	AAC Converter View other audio file formats
Technical Details	AAC is similar in concept to MP3 but goes further. It too compresses digital audio files but to a bigger degree. It is also part of the MPEG-4 standard, it is most widely used to create small digital audio files. The current variant is specified in ISO/IEC standard 14496-3. Like MP3, AAC is a lossy algorithm. The human hearing system cannot hear quiet sounds in the presence of loud sounds of a similar frequency; for example, a voice conversation cannot be heard while an aeroplane flies low overhead. This is known as auditory masking, this allows the discarding of data with minimal loss of quality.
Associated programs	iTunes Windows Media Player RealPlayer KMPlayer VideoLAN VLC Media Player
Developed by	A combination of Fraunhofer IIS, AT&T Bell Laboratories, Dolby and Sony Corporation
MIME type	audio/aac
Useful links	More detail about the AAC file format How to play AAC files

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