Is it possible to make a form button that will simply close the page?

Hello,

Is it possible to make a form button that will simply close the page when you click it?

What I have in mind is this:

One button is labeled, "Task Complete", and when someone clicks on it it functions like a "Next" button.

The other button is labeled, "Close", and when someone clicks on it it simply closes the page.

(Or if that is not possible, if I could make it function like the "back" button that would be good too)

Is there a way to do this?

Thanks!