Copyright by Axandra.comWeb site promotion software
With the release of the Penguin update, Google started to count bad links as a negative ranking signal. Websites that purchased backlinks or gained backlinks through spamming (blog comment spam, forum profile backlinks, etc.) were penalized by Google.
Many webmasters worried that other people might create bad backlinks to harm their website rankings. The new disavow link tool enables webmasters to tell Google that particular links should not count.