MPEG-1 Audio Layer 3 or as it is more popularly considered, MP3, is a patented digital audio encoding format which implements a form of lossy data compression. The lossy compression that is used in the MP3 algorithm is designed to profoundly decrease the amount of data needed to represent the audio recording while still sounding like a pretty good reproduction of the original uncompressed audio for the majority of listeners who use this format. An MP3 file that is developed using the setting of 128 kbit/s will produce a file that is about 1/11th the size of the CD file created from the original audio source. An MP3 file can also be generated at higher or lower bit rates, with higher or lower resulting quality.
Video CD which is almost always abbreviated as VCD, is a standard digital format used for storing video on a Compact Disc. VCDs are able to be played in dedicated VCD players, most modern DVD-Video players, personal computers, and within some video game consoles. The VCD standard was established in 1993 by Sony, Philips, Matsushita, and JVC and is considered the White Book standard. Video CDs are authored using the Mode 2/XA format, allowing an estimated 800 megabytes of VCD data to be stored on one 80 minute CD in comparison to 700 megabytes when using Mode 1. This in combination with the net bit rate of VCD video and audio, means that almost exactly 80 minutes of VCD content can be stored on a conventional 80 minute CD, 74 minutes of VCD content on a regular 74 minute CD, basically it may use the exact amount of time specified by the CD. The VCD standard also gives the user the option of creating DVD-quality still images/slide shows with audio, at resolutions of 704×480 (NTSC) or 704×576 (PAL/SECAM). Version 2.0 has the playback control (PBC), which features a simple menu akin to DVD-video.
Sometimes it may be necessary to convert a VCD to MP3 for increased compatibility with a wider range of products and also as a better storage solution. To accomplish this you may use any software that is able to convert from VCD to MP3.