What are demos?

I always thought Demos were like rought drafts but I have listened to a lot of bands who call it a demo but it sounds very polished. I have also heard demos that sound like they were made in the garage.

For example http://www.myspace.com/adelitasway

there songs are demos but they sound cd quality. What is the exact meaning of Demo in terms of music?

Then I am assuming demos are mixed but not mastered?

[QUOTE=airtas;2240362]I What is the exact meaning of Demo in terms of music?[/QUOTE]http://en.wikipedia.org/wiki/Demo_(music)
:smiley:

[QUOTE=mciahel;2240383]http://en.wikipedia.org/wiki/Demo_(music)
:D[/QUOTE]

checked that out but i dont think that really applies nowadays