It kind of is. Its meaning is a lot fuzzier than most though, because it means both a certain style of music and something along the lines of 'independent record-label'. Its IS a genre, but its a very vague genre.

Very vauge, considering it can cover everything from Art Brut to Jedi Mind Tricks

Yes. Whoever the purveyors of genre-naming are, they really ballsed it up when they named Indie. Somebody should have come up with a different name early on and avoided all the ambiguity.

WE NAMED THE DOG INDIE

Indie/electro!!!

New Wave Industrial Jazzcore

what sort of music is that? give me a song that is that genre so i can listen to it please :)

I mean Indie as in the style of music, not the Independent label kind of Indie. If only they had 2 different names so everyone wouldn't get all confused.

What sound does indie have?

You know, I can't explain that. It's just when I hear something I can determine that it has an Indie sound/feel/vibe to it.