Backlinks are other websites linking to the content on your website. ( VISUAL )

The authority and organic search results of your domain depend on the amount and quality of your backlinks. The more the better is an old SEO strategy, quality is key is the strategy of the present and future.

Good quality backlinks are niche related contextual links or in some cases home page links. The authority of the domain linking to yours and their traffic is rather important for the link juice provided by the link.

To generate a large amount of low quality spam links is very bad for your domain and its results since search engines penalize you for having such links pointing to your domain.

Domain authority is a metric that is used to give a value to the authority of your domain, between 0-100.

Page rank is an outdated metric used by Google and named after one of its founders Larry Page.

Referring domains simply means the amount of domains pointing to your website

The on and off page optimization of your websites and pages so that they are attractive to get a top position In search engine search results. (Google, Bing, Yahoo, Yandex, DuckDuckGo and so on).

Spam score is a metric used by various search engines to give a value to your domain regarding the amount of incoming backlinks from spam domains.

Spam backlinks are considered very low quality backlinks from spam domains.