are you talking about exchanging articles? If so then it means that two webmasters exchange articles for their sites. Those articles also contain links to the original author's site.
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Trading articles is like exchanging backlinks for your site it is when two site owners had an agreement of posting each others articles to their sites with their links on it. If I were you I'll go on for article submission
Article writing and distribution is one of the most important trick to promote your website online. Get your copyright article and distribute in article distribution directory. you can improve your ranking and your brand popularity.
It is the process of exchanging articles so as to boost each others' sites higher in the serps by building links en masse and GIVING link juice. The idea of article trading is a new one, I wonder when that tactic will be added in regards to viral content so as to make a stronger effect.