Generally keywords are considered as the anchor text and it have URLs which performs in two ways like to increase the visitors traffic as well as to get ranking on search engines. But for this you need to buy starting pagerank backlink or what are backlinks and then your website will be on the better ranking page. This ranking will definitely increase your profit. In this way you have two types of links that are dofollow links and nofollow links which are based upon the placing on inner page PR. On PR the blogs that are included have importance, therefore only mature blogs are presented on it