Do you know a good link from a bad one? Here we look at how you can measure link quality, to improve your SEO performance.

Google’s Penguin algorithm, which launched in 2012 and has had subsequent updates since, was designed to filter out anyone gaming the system by buying or obtaining high levels of backlinks to make sites rank better. Consequently, Google favours quality links over quantity links. But even though the backlinks game has evolved, backlinks remain an important ranking signal to Google. If you want to know what inbound links you have to your site and how good they are, here are 5 backlink checker tools you can use.