Differences Nofollow and Dofollow

Nofollow is an HTML attribute value used to instruct some search engines that a hyperlink should not influence the ranking of the target link in the search engine's index. This is intended to reduce the effectiveness of several types of search engine spam, thereby increasing the quality of search engine results and preventing spamdexing from happening.


Simply put, when you use the nofollow link means that when search engines access to the courtyard and past the link, he will not further explore these links. Because not traced any further, then the link does not affect the number of backlinks and also does not affect the rating.


Understanding Dofollow
You do not find dofollow on wikipedia? Should you need to know, because actually there is no tag dofollow. This is just a term to distinguish with nofollow links. When you let your links dofollow, so when search engines read your page and find the link, he will further explore these links so that search engines produce a report, in this case related to the amount of backlinks and ranking consideration.


Writing Nofollow
When you add a link to your post, then the link automatically registered as a dofollow link. To change this, please write as follows:
rel = 'nofollow'> name link


Not Found Writing For Rel = Dofollow
As I wrote above, is not actually a rail dofollow. It's just a term to distinguish it with nofollow links. Therefore there is no writing for dofollow links. Written without a rail link has meant that dofollow nofollow.

The addition of rel = dofollow on the link, such as the following is useless.

rel = 'dofollow'> name link
So, for example when you try to spam blog comments forced on others by adding dofollow, then it is in vain.