I have a PR3 website, and having lower PR backlink, is it helpful or harmful for my website. Somebody told me that you got traffic from that back-link but not helpful to increase my PR. Plz Reply
Do not worry about low PR back link.Because when its PR will increase definitely your website will get benefit.
As long as it is relevant to your site and has a good content it will not harm your site thus it will help you in order to rank on search result. Remember that google dont rank sites on how well it is optimized but rather how relevant your site on the search query.
PR is never a site indicator anymore. Google did change the way they treat with PR for each site. You could look for other factor such as domain age, website history, relevancy.
Relevancy, quality and quantity. Yes, these are the things you should be worrying about with backlinks. Having a link from a lower PR page than yours isn't harmful at all.