I really don't get it. From looking through the front page of the site, I see a bunch of code examples, but no explanation of how this differs from using Unix

I really don't get it. From looking through the front page of the site, I see a bunch of code examples, but no explanation of how this differs from using Unix with a bunch of programs that each read from stdin and write to stdout. I'm sure there's actually something useful about this product, but the website really doesn't give any indication of what that useful thing is.