What is the difference between do follow and no follow links

[m3itelecom]

I want to learn how do follow link differs from a no follow one.Are they both helpful in improving the traffic..!

[MikeJsimon]

do follow link : your site get pr juice + back link.
No follow link : your site only get back link.

[qr8gul1]

The nofollow code tells search engines not to crawl or pass page rank through this link, which means that you’re not getting credit or link juice back to your site.

Do follow links will deliver link juice to your site.