What is journalism?

I am teaching a course for journalists from Asia.
One of my standers questions to all my students is "what is journalism".
Here is one answer:

What's is journalism? This seems a simple question for everyone that choose journalist as their profession. But for me, the definition of journalism is complicated. It seems like pornography. The specific definition varies from person to person, but in general, you know it when you see it.

Ahhhh! The journalist as pornographer :-)

I will be posting all their answers and links to their blogs in a later posting.