PR articles are a certain form of advertising. These are texts that can be placed on various specialized servers, thematically related sites, on their own website, on blogs or in internet magazines. Their writing is subject to certain rules.
More profitable advertising than advertising is paid, and a variety of meaningless advertising banners that no one cares about are PR articles. They have the opportunity to engage in text and form, and to reach a certain group of readers directly. This will increase your website's targeted traffic. This means a higher chance of selling goods or services.
PR articles will remain the Internet location where you pasted them. Paid ad will disappear over time. There are PR servers where articles can be placed free of charge, and there are other options, both free and paid.