Article rewriting does not mean rephrasing an article with synonyms or just making its sentence active from passive and vice verse. The main objective of article rewriting is just the opposite. It means enriching the content of an existing website by updating it with latest information. For example if you have writing an article on SEO tips two years ago, it needs to be infused with latest information time to time to keep its relevancy. Sometimes, you just want to add some interesting topic in some other websites or blogs and you are desperately looking for posting something related to that topic. Now you can not copy and paste the entire article in your website because of the copy right issue or you are reluctant to give any link back. In that case, article rewriting can be the best possible option that you should utilize to its fullest extent to increase the popularity of your website or blog.
Though there are a number of companies offering article-rewriting services, you should not trust them without viewing any of their previous samples. Writing a creative article is not a trivial thing, you have to remain aware of the latest updates of this field otherwise; your website would not be able to mark any significant impact on the minds of the readers.