Link building is done to increase inbound links to a website. And in return these back links help in improving SERP of your website on your targeted keywords. To build links you can perform directory submissions, article submissions, blog posting, blog commenting, forum posting, reciprocal link exchange etc.
This will help you:http://www.google.co.in/#hl=en&expIds=17259,27103,27584&xhr=t&q=link+building&cp=2&pf=p&sclient=psy&aq=0c&aqi=g4g-o1&aql=&oq=libuilding&gs_rfai=&pbx=1&fp=68659218eb7f0e93 Thanks will be appreciated!!
Link building is a powerful way to get your website high at the search engine by creating the inbound links to your website.
Link building is done in-order to increase your link popularity which in turn boost your websites in top spots of SERP.
As mentioned above, link building is simply to increase your website's position on the search engines... You need to get as many websites to link to your website as possible...this way search engines such as google think your website is important and give you a better position..