Windows Media Audio (WMA) is an audio data compression technology developed by Microsoft. The name can be used to refer to its audio file format is audio codecs. It is a proprietary technology that forms part of the Windows Media framework. WMA consists of four distinct codecs. The original WMA codec, known simply as WMA, was conceived as a competitor to the popular MP3 and RealAudio codecs. WMA Pro, a newer and more advanced codec, supports multichannel and high resolution audio. A lossless codec, WMA Lossless, compressed audio data without loss of audio fidelity (the regular WMA format is lossy). WMA Voice, targeted at voice content, applies compression using a range of low bit rates.
MIDI stands for Musical Instrument Digital Interface (Musical Instrument Digital Interface). This is a standard serial communication protocol that allows computers, synthesizers, sequencers, controllers and other electronic musical devices to communicate and share information to generate sounds. This information defines various data types such as numbers may correspond to particular notes, numbers synthesizer patches or driver settings. Because of this simplicity, the data can be interpreted in various ways and used for purposes of music. The protocol includes additional hardware and software specifications.