Low quality inbound links are link that won't increase the search engine rankings of your web pages. In the best case, low-quality links won't have any effect at all on your rankings.
In the worst case, low-quality links will have a negative influence on the rankings of your pages.
Links that contain the nofollow attribute might help you to get direct traffic from the website with the link, but they are useless for your search engine rankings. The nofollow attribute is a HTML attribute that has been introduced by Google, Yahoo and Bing.
It allows webmasters to mark links that should not be followed by search engine robots. If Google finds a link with the rel="nofollow" attribute, Google will not use the link as a positive signal for the linked page.
Automated linking schemes usually promise hundreds of links in a very short time with very little work. As these linking schemes have been created for the sole purpose of cheating search engines, search engines don't like them at all.
All major search engines have employees who actively seek for these linking schemes. Search engines know all linking schemes and links from these schemes don't have a positive effect on your search engine rankings. Worse than that, many search engines will ban your website if you link to a linking scheme website, because they consider it spam.
Avoid these automated linking systems at all costs! Use common sense: If you can find the automated system, search engines can also find it.
Some websites do not link directly to your website. They link to a page on their own website that redirects to your website, for example, "//www.example.com/redirect.php?3152."
You might get direct traffic through these links, but they won't help your search engine rankings.