Google page rank was introduced in the name of Google founder Larry Page.
if your website content unique and it is attracting many users online then we can get page rank.

You need to find quality sites

To increase the PR for page, it must attain a sufficient backlinks and good traffic. The backlinks might be from good PR pages leads a better result. Try SEO and SMO.

Write fresh content and give High Pr backlink.

you can increase pr by getting some good quality of backlink.
posting a unique content.

By submitting our link to different sites like forum, blog commenting, articles, web 2.0. But we have to submit our link to relevant sites.

must have good content, many backlink and good traffick..

Add new and unique post on regular basis.

Post quality content and creates high authority links and also use internal linking.

all you hve to do is maintain relevancy and do SEO

increase pr not easy. you have to wait for long time.
you have to write quality of content and make so much quality of backlink.

With the help of following Google Algorithm & Getting High Pr backlinks

The best technique to increase PR:
1) Your pages should be topical and have a high keyword density and low code to text ratio
2) Homepage should be linked to websites with PR higher than the Homepage
3) Homepage should have more back-links than the inner pages.
4) Inner-pages should be well linked to Homepage
5) Site should get regular traffic with lower bounce rate

Quality Backlinks are the only choice you have. Low quality backlinks can get you kicked out from the search engine index. But getting quality links that are related to your site can have a massive effect.

By doing some activities like:

Article submission
Blog commenting
web 2.0
Forum Posting
Fresh and unique content submission.