What is rel "nofollow" attribute and how it helps SEO

[fromrachel]

What is rel "nofollow" attribute?
Does it really matter you?
Does it help in your SEO?
How do you think about it?

 

[arronmattwills]

no follow attribute never helps to improve the website ranking in search engine results. No follow means search engine will not consider that link for it's indexing.

 

[suryaprabha]

No follow links are also needed in link building activities..they are useful to drive traffic.