What happens when someone clicks the Facebook Like widget?

What happens when someone clicks the Facebook Like widget?

I put the Facebook Like Widget on my Zoho free website. I tested it with my Facebook, and when I hit the button, it made me sign into Facebook and it recorded that I liked the page, but it didn't actually post to my Facebook wall or anything. Is it posting somewhere else, or does it just not post anything on Facebook? And if it doesn't post anything to Facebook, what's the point of the button (I'm just curious)? Thanks!