Increased back link:

1) Commenting on others blogs:
When you add a comment on a blog, they get indexed and you get a backlink.
In the comment field, enter your name, website URL, email address and comment. Please DO NOT include a link in the comment or it will be marked as a spam by akismet or the administrator. Comment on useful blogs and not on all blogs which you find. Comment something useful rather than commenting “wow thanks”, “nice tips” , “thanks nice post” ..

2) Directory Submission:
Submit your site to directories and free directories, they might cost a bit, but they are good, find some free and paid directories here These directories better your PR and increase your backlinks

3) Link Exchange:
If you are new to the term Link Exchange then please read this post about Doing link exchange

4) Participate in Forums:
Use your site link with a nice anchor text on the signatures of Forums. Keep posting on forums and they would probably increase your backlinks. Don’t make them spammy as they would be deleted by the moderators there at the forums.
You can search for forums or I know a few of them:
Digital Point Forums
SitePoint Forums
SEO.com Forums
Web Talk Forums

Well manikandan... I want to know that paid directories or paid Links are beneficial in website ranking...

Nice SEO tips ,
Actually all this is required for getting a good back links. Now a Forum is also been used for getting back link by many of the webmasters.
thank you

Outsourcing, Website marketing

Nice Tips for seo yar