I have often read in many posts the word " Spam Back Links " but still have no understanding of such a links and what are their effects in ranking of a site under a particular keyword.
It's a link from poor site, or site which is included in link farm. Just look at this site from eyes of a visitor. How does it look like, what info it presents. Is it interesting, is it worth reading it, is it presenting any value. If it looks spammy with no content (just links) then it's spam. For a while it will help getting better results in search engine, but very soon this site will sink your site to bottom of the web
I like to keep things simple when it comes to SEO- Bad backlink = a link from a domain that is not in Googles index Good backlink = everything else
Dear brother , spammy link may harm your site, always try to get quality backlinks from page rank sites.
Spamming in link building will not give you any benefit. It's a form of black hat technique. And your site any affect on this. Its better to follow the rules and guidelines of what hat SEO.
If you are not building backlink by following google guideline then it will consider as spam backlinks. You need to follow the process of white hat seo otherwise your ranking will get drop on search engine.
Bad backlink = a link from a domain that is not in Googles index Good backlink = everything else Agreed