A terrible backlink is a connection that comes from a not-so confided in site. Since the Penguin calculation change in 2012, Google has been taking action against awful connections. Basically, individuals were paying for joins so they would have higher rankings and more significant position — not alright. Thus, Penguin was sent off. Rather than working on their rankings, this update really punished website pages that were related with these terrible connections.
There are numerous assets accessible to find these nasty backlinks: both free and paid.  There, you can see a rundown of site that connect to your site. As a rule, these connections help your SEO and are generally from sites like Yelp, virtual entertainment, or Better Business Bureau; nonetheless, there might be joins that aren't trusted and are hurting your SEO.

POOR BACKLINK
POOR BACKLINK