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there are hundreds of websites that provide dofollow backlinks

Googles answer about what back links are (as related to blogging) - http://support.google.com/blogger/bin/answer.py?hl=en&answer=42533 . I think its important to hear what they have to say. If you are looking to rank on search engines you should know what they think about back links and how you get them.

Buying back links can be a tenuous practice if you're not sure whether they are going to help or hurt your rankings according to Google. Recently algorithm updates by Google have penalized sites that have less than reputable back links.

I always recommend getting links naturally rather than buying them. Blog posts, guest blogging, press releases, social media signals etc. Are all ways to get good solid back links to your site.