How are street art and graffiti different?

I believe street art is done by setting a booth with their artwork displayed the legal way and gets paid. While graffities are done randomly on buildings illegally and don't get paid. That's just my theory...

I don't think there is a difference most of the time. Some people refer to gang tags as graffiti which is ridiculous. I have seen amazing graffiti artists. But on a legal standpoint I think the issue is whether or not they have the right to put graffiti in certain places.

there is no right or wrong answer to this question. Street art can be any form of graffiti art or even pasties including some of the artwork that Banksy does. www.banksy.co.uk/

There are always going to be fine lines between these two hemispheres and it is up to the creator to decide what their style revolves around.

Graffiti is a form of self expression and in no way should be seen as some kid coming out and being destructive. There will always be graffiti artists and street artists of different kinds who are looking to leave their mark upon the world.

Street artists are looking for appreciation and money.

Graffitists are no different than dogs, just marking their "territories".

I find its a matter of perspective, check out these artists - http://hubpages.com/hub/Steel-City-Street-Art-Shef