PR articles are used to advertise and promote. They can promote a business, idea, opinion, product, or service. Further their role is also to increase the position of the site in Internet search engines. This is because they contain backlinks. Search engines evaluate backlinks based on their quality.
Trackbacks that include PR articles, for example, serve search engines as a sign of importance and popularity for the page. This scrolls the page above and increases its position in the search results. This is an important process for increasing the traffic and popularity of the site.
PR articles are along with other steps an important tool for linkbuilding, which is building back links. The next steps include registering your site to catalogs, exchanging and purchasing links, writing blogs, creating supporting websites, and more.