What is the difference between do-follow & no-follow backlinks?

If you’ve been doing any kind of reading about link building, then  you’ve probably seen people mentioning “nofollow” and “dofollow” links.
One of the most important way to achieve high search engine ranking results is to get other blogs or websites to link to your site. If these links are NoFollow then Google doesn’t count them as a link and are the links useless for your search engine rankings.