The nofollow or nofollow tags is a property that we can give a link or division of our blog Google does not index to  that part of our blog. In other words, the nofollow are anti-trailing spiders that prevent that part of our blog to be indexed by Google.

When talking about nofollow, Is usually spoken of sale or exchange of links. Then if we put the property nofollow, The link would not be tracked by Google and do not be useless to another user improve positioning.

In addition to the nofollow there is another feature called dofollow, Which is the opposite of nofollow and would like not to place any of the two properties, but they say that if we enter property dofollow a connection or division, indexing will be faster.