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MP3, or MPEG-1 Audio Layer 3 is a digital audio encoding, lossy compression format, and algorithm, designed to reduce the amount of data required for representing audio, but to most listeners sound like original uncompressed audio.
MP3 is an audio-specific compression format which provides representation of pulse-code modulation-encoded audio in less space than straightforward methods. It uses psychoacoustic models to discard components less audible to human hearing, and records the remaining information in an efficient manner. Similar principles are used by JPEG, a lossy image compression format.
MP3 has considerably superseded MP2 for PC and Internet applications.
Each MP3 file is made up of multiple MP3 frames which consist of the MP3 header and the MP3 data. These frames are independent items: it is possible to cut them from a file and an MP3 player would be able to play it.
3GP is a multimedia container format defined by the Third Generation Partnership Project (3GPP) for use on 3G mobile phones.
3GP is a simplified version of the MPEG-4 Part 14 (MP4) container format, designed to decrease storage and bandwidth requirements in order to accommodate mobile phones. It stores video streams as MPEG-4 or H.263 or H.264, and audio streams as AMR-NB or AAC-LC. A 3GP file is always big-endian, storing and transferring the most significant bytes first. It also contains descriptions of image sizes and bitrate.
The largest mobile phone manufacturers are Nokia, Samsung, Motorola, Sony Ericsson and LG.
