MID is a sound file format developed by the MIDI Manufacturers Association and is a standard extension for MIDI (Musical Instrument Digital Interface) audio files. Using files of the specified format, the encoding into the standard format of most MIDI data is performed. This standard format is used for the interaction of various devices and programs. The exchange of musical information is between instruments, synthesizers and computers. MID files do not contain the musical data itself, but their attributes - for example, information about how long certain notes sound, or about the pitch, tonality.
WAV (or WAVE) is actually the first full-fledged audio format with good sound quality. It was developed quite a few years ago by the joint efforts of Microsoft and IBM. Sometimes this format is even called “Audio for Windows,” because it is the standard for storing audio stream for a traditional Windows desktop computer. Full name - Wave Audio File Format. The short name is derived from the English word wave ("wave"). The peculiarity of this format of digitized audio stream is the lack of compression. WAV files take up too much space, but it is ideal for storing high quality files in their original form.