What about recipricol links?

One of the many factors that search engines look at in ranking a website is the number of other websites that link to it. In this sense, trading resipricol links with other sites is helpful in improving search engine rankings. However, as search engines become more sophisticated, it appears that recipricol links are no as helpful as they once were. It is important that a website contain content that is of high enough quality to gain links from web sites purely for the information that your website offers.