http://news.ycombinator.com/item?id=2 which is http://www.paulgraham.com/mit.html : A Student's Guide to Startups.

So, I don't take Business Classes (I am in Engineering, closest thing we had was one course: Engineering Economics) and Paul said in his essay near the end

     One thing you can do while you're still in school is to learn how startups work.

I saw some threads here, that said they hacked together an app on the weekend and then label it as a startup. I honestly thought it was just a weekend project. So is the term more or less flexible ?

As someone who has a startup, how do they work ?