Having plenty of good quality inbound links to your blog will improve your ranking in the search engines. Google started life as a student project to rank the importance of websites based on the number of incoming links; link popularity is still at the heart of Google's ranking process.
But for many people, link building seems like a daunting task. How do you get other people to link to you? It's actually not as difficult as it first seems—once you get into it, you'll see there are plenty of strategies to use. The point is to stick at it and treat link building as an integral part of your blogging routine.