In simple words, the owner or administrator of the reputed website is getting a new traffic by joining in some exchange of traffic web sites by understanding between the members. It means, your website appears as a link in other member websites and in your web site, there is some link appears to regard your member web sites. If any visitors visited your member site, from there if he clicks on the link related to your website, your web site will be appeared to a visitor.
The entire scenario depends upon the understanding of you and your members. The main trick with this exchange of traffic is if anybody surfing the internet, you need to capture the attention to visit your website in fewer seconds. There are lots of websites are providing these services for free of cost. To get a more credit ratio, you need to pay few dollars. With this additional account, this will allow you to get other features and some more credits. And referral program is another way, if you refer to anyone about these exchanges of traffic web sites, you will be some more credit points. The main advantage of this exchange of traffic is to create awareness about your product through worldwide customers.