Any site owner knows that the main visitors come to his project from popular search engines (Google, Yandex, Rambler). And the visitors came specifically to you, require a high position in the ranking of your site's search engine. Woo this in different ways, and one of them - site promotion articles. Official site: Novelist. The article is the text readable, this text search engines regard as a content site that hosts the article. In other words, Article is not just a "naked" link. The text of the article posted a link to your project, and such links for search engines are natural, therefore, no punitive sanctions imposed on it will not. That is why site owners always want to add articles to article directories.
Essence, in general, is simple, write a unique article, paste in the text and its links contains articles on other thematically similar projects. But the problem is that post an article on a large number of sites is not so simple, and write unique articles in large numbers, too. Agree that most write unique articles for a long time, and ordered their copywriters Exchange will automatically check the unique articles for indexing in Google and Yandex, also automatically take off their sites, which are not indexed, and put them in a "black list". In addition, the exchange of articles follow the speed and interest rate at each individual site, which greatly facilitates the selection of these very grounds on which your article will bring real results.