Link building is the active process of acquiring backlinks from external sites in order to increase your domain's authority and improve your Google ranking.
Link building covers all the strategies through which you obtain links from other sites to yours. White-hat methods: guest posting (writing articles for other sites), digital PR (getting cited in the media for original data or studies), broken link building (replacing dead links on other sites with your own content), creating linkable assets (guides, calculators, studies). Grey/black-hat methods (penalized): buying links, excessive reciprocal exchange schemes, link farms.
Link building remains one of Google's strongest ranking factors. Domains with more quality backlinks rank higher for almost any keyword. The difference between #1 and #10 is often the difference in link profile, not content.
Source: Ahrefs β Link Building GuideA backlink is a hyperlink placed on an external site that points to a page on your site, signalling authority and relevance to Google.
Domain Authority is a score from 0 to 100, created by Moz, that estimates how well a domain can rank on Google results pages.
Anchor text is the clickable text of a hyperlink that tells Google and users what the page the link points to is about.
The dofollow attribute (default) lets Google follow a link and pass authority, while nofollow (rel="nofollow") signals that the link should not be followed and passes no PageRank.
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