what traffic exchange means?

Traffic exchange sites allow you to promote the url to your website or an affliate link that you are promoting. In return you have to surf other people's sites to get views or credits. Some of them offer payment for surfing while others don't. Some people say that they do well out of them but they are time consuming and the traffic isn't that well targeted on some of the sites.

Simply said, you visit another people's site, and in return people will visit your site. The site can be anything: your own blog, your referral links, and so. But there will be no guarantee sign ups, also there will be no guarantee sales. These kind of traffics have such low quality..