The idea behind including backlinks as part of the page rank algorithm is that if a page is good, people will start linking to it. And the more backlinks a page has, the better. But in practice it is not exactly like this. Or at least you cannot always rely on the fact that your contents is good and people will link to you. Yes, if your content is good and relevant you can get a lot of quality backlinks, including from sites with similar topic as yours (and these are the most valuable kind of backlinks, especially if the anchor text contains your keywords) but what you get without efforts could be less than what you need to successfully promote your site. So, you less than what you need to successfully promote your site. So, you will have to resort to other ways of acquiring quality backlinks as described next.

you mean "how"

getting low quality backlinks is easy, but getting high quality backlinks is the exact opposite...however, the benefits is huge and lasting

These are some ways to acquire high quality and relevant backlinks:

1. Guest Posting (blogs within the same industry your website operates)

2. Squidoo lens creation

3. Hubpages content creation

4. Press Release

All major search engines rely on back-links, counting them as "votes" to your website.

You need back-links. Everyone say that the natural way of getting back links is the best, but the truth is that no-one will ever link to you a newbie website. Been there, done that.

First, you need quality content (research etc). Than, submit your website to some quality web directories (DMOZ, Yahoo and so on). Once you get some traffic, continue with the quality content.

high pagerank dofollow backlinks few of them Just few, it`s not easy work you need dofollow backlinks from pages have a high pagerank not a domain have a high pagerank.

There are so many processes. You can do forum, blogs, articles, guest post etc. BUt they should be done in proper manner.