One of my favorite videos about SEO and linkbuilding is this somewhat old video from Google's former employee: Matt Cutts.
Note that he tells that Googlebotten follows links. That's the way Google search engine is built and if there were no links on websites to other websites, Google's database would not be that big.
When Google Bot follows a link, it naturally considers both sides: Since, it leaves and since it arrives.
From there comes the terms:
Internal links - The links that go from one place on your website to another place on your own website - eg from your front page to your bottom.
External links - The links that go from your website to other websites - for example, if you link to a source.
Backlinks - The references you get from other websites to your website - I have, for example, a link from Amino to my website.
The Google Bottom forms a score on both sides as it uses to index the pages in its database. If it is in place no. 2.356.243.234 or if it is in place number three.
In the search engines' early days, the purpose of linking to other pages was always to find more information about a given topic.
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