Link buildings is a part..

[nekaguy]

Link building is an important part of optimizing of our sites, for that the main aspect is we have to submit our site URL in the appropriate site in the submission page mentioned and In exchange we must have to put the Site’s URL in any of our Site page. There should be regular check up of our Site URL as it’s not always confirmed that the respective site would maintain or keep our URL in its submitted page. Some time we have to submit the URL according to PR of the respective site. If we are doing to this in a regular manner, a well defined optimizations can be done.

[racistkiller]

Search engines(at least Google) are said to like the sites which are linked to relevant to their niche. So when you start link building, you should concentrate on getting backlinks from sites of the same niche. And yes, you have to select high PR sites when you are linking reciprocally, which is hard. Also when you are submitting to directories, don't forget to submit to directories that are the same niche as your site is.