Framed redirects are one of my biggest pet peeves on the web. You click on a link to visit a site, the site loads, and the URL in your address bar is different than what it should be.
Technically, a framed redirect works by loading a hidden framed page on top of a second framed page which displays the target content.
Imagine clicking on a link for Amazon, pulling up the Amazon website, but seeing the URL amazonblackhataffiliate.com in your address bar. You would be able to browse the entire Amazon site, make purchases, etc. but the URL in the browser bar would always display amazonblackhataffiliate.com. This is the experience of surfing a site through a framed redirect.