However, the search engines algorithm are highly sophisticated and would naturally relate no information about a website's URL linked to websites that are not even recognized by the natural search engines. Having a link or several links to your website is very important in search engine optimization, but such links must be appropriate, legitimate and should be recognized by Google, Yahoo and other search engines.
However, there are ways you can achieve link building that will yield the desired results.
A link building strategy that has the possibility of achieving good search engine optimization should be done on the basis of relevance. Meaning that your links need to be about or placed on sites that have the same or similar content. For example, if you site is about building race cars, you are not going to put your links on websites about cooking or daycare.
Otherwise, your website will be vague in the eyes of Google as it will have no relevant information to display about your site; in fact, Google can decide to penalize your site and even go so far as to block you in its search engine results. There are some sites that are trusted and highly recognized by the search engines you will want to find the ones that are related to you website and ad your links there. This is a very good way of achieving a good search engine optimization. Through this means, you have the ability of adding a link back to your site; more importantly, the site will be relevant to your website, and therefore boosting you page rank and moving you up the ladder in Google's eyes.
You really need to grasp the power of link building, which are found at article submission sites. This is also know as article marketing. What this allows you to do is place relevant content on different article marketing sites. At the bottom of your content you are then allowed to place links back to you site. Usually you are allowed to links per article submitted.
There's a lot more to learn about link building that guarantees search engine optimization, just get online and explore them.