What is "Art"?

Exactly that's the question..

I never quite sure what that thing means..

My flatmate defined "art" as:
"All the things that I couldn't understand"
well.. in some case that might be true..

a blur picture can be a masterpiece of art..
even a stain on the wall could be an art..
people can argue that every single human creation is art..

even a technological research paper can say: ".. as state of the art of .. "
O___o??

So what is exactly is art?

Surounded by "art" people in my school, make me winch... What do they mean? So abstract, could not really understand..
During the art exhibition in University of Art, my friend was explaining about her installation.. "blah blah blah.. so this goes there, so blah blah.." ... so? what for exactly? What is the function? How can we make use of it?

Art.. IMHO is a form of human that can be enjoyed.. BUT, if we don't understand it, how can we enjoy?

Music, as one of the form of art, I appreciate it and love it soo much..
The same case as the other forms, Photography.. Film.. Web Design.. Printing Design..
I love it..

but abstract painting and sclupture.. unreasonable singing in opera.. understanable installation.. hem.. not really my area.. even for an abstract film, I couldn't get it..


based on Wikipedia.org:

"Art refers to a diverse range of human activities, creations, and expressions that are appealing or attractive to the senses or have some significance to the mind of an individual."