What is the difference between midi and digital audio?

MIDI is *NOT* sound. It is performance information.

IE: the key C3 was triggered for 1 second at a velocity of 90

Digital Audio is a broad term - sound is captured/stored/modified/played back from combinations of 0's and 1's to re-create an analog sound signal.

MIDI is device dependent. it doesn't transmit an audio signal or media. it transmit "event messages" such as pitch and intensity of musical notes to play control signals for parameters such as volume vibrato. midi needs sequence software sound synthesizer lets u record or edit data soo editing is easy. if u digitized bitmap graphic image to vector graphic, midi is used. MIDI file size is small. it requires less memory or file format is small. As they are small, can embedded in web page and load & play quickly. It contains actual signal or voice.

Digital Audio: It is device independent. when record a digital audio, signal from analogue sensor like microphone is sampled using frequency and converted to digital format using an ADC converter. for playing music their info is again converted to analogue audio signal. Digitizing audio simply play the audio through a sound card. editing is not easy. file size is large so fie format is.. it not contains actual signal..