If you have been quoted for SEO, link building was almost certainly a line on it — often the largest one. It is also the part clients understand least well, which is unfortunate, because it is the part where money is most easily wasted.
This is an attempt to explain what it actually is, why it still matters, and how to tell a campaign worth paying for from one that is quietly burning budget.
What a backlink actually is
A backlink is simply a link on someone else's website pointing to yours. That is the whole mechanic. The reason it matters is what search engines infer from it.
Google's original insight, and still a load-bearing part of how ranking works, was that a link is a vote. If a lot of respected sites reference a page, it is probably worth reading. That idea has been refined enormously over twenty-five years, but it has not been replaced.
So when your page competes against nine others for a commercial term, links are one of the main things separating them. Content relevance decides whether you are eligible for the result. Authority substantially influences where in it you land.
Why links still matter, despite the obituaries
Every couple of years someone declares link building dead. It never is, and the reason is structural: search engines need signals that are expensive to fake.
Anything you control on your own site — your copy, your headings, your schema markup — is cheap for you to manipulate. Signals from other people's sites are harder to manufacture, which makes them more trustworthy. That asymmetry is why external links have survived every algorithm shift that was supposed to kill them.
What has changed is the tolerance for low-quality links. Fifteen years ago volume worked. Directory submissions, comment links, article spinning — all of it moved rankings. Successive updates, most visibly Penguin, made those tactics not merely ineffective but actively harmful. The bar moved from how many to from where.
The three things that make a link worth having
Not all links are equivalent, and the gap between a good one and a bad one is enormous.
Relevance
A link from a site about your subject is worth substantially more than one from a site about nothing in particular. A dental clinic linked from a dentistry publication is a meaningful signal. The same clinic linked from a general "business tips" blog that also covers cryptocurrency and pet grooming is not.
Relevance is the single most useful filter, and it is the one most commonly skipped, because irrelevant links are far easier to acquire at volume.
Authority
Sites vary in how much weight their links carry. Third-party metrics — Domain Rating, Domain Authority, Trust Flow — approximate this. They are useful for triage, but they are estimates produced by companies with their own crawlers, not numbers Google publishes.
Treat them as a first filter, then look at the site. A high metric on a page nobody reads is a warning sign, not a recommendation.
Placement
Where the link sits matters. A link inside the body of an article that a reader might plausibly click is worth far more than one in a footer, a sidebar, or a list of thirty unrelated links at the bottom of a post.
If the link would look odd to a human reader, it probably looks odd to Google too.
How link building is actually done
There is no single method. A real campaign combines several:
- Guest posting — writing an article for a relevant publication that includes a link to your page.
- Niche edits — placing a link inside an existing, already-indexed article where it genuinely fits.
- Digital PR — creating something worth covering, so journalists cite you.
- Editorial outreach — asking site owners to reference a resource you have built, on its merits.
- Competitor analysis — mapping where competitors earn links, then working out which of those are winnable.
The mix depends on the vertical. In competitive spaces such as iGaming, the available inventory is narrower and quality varies far more, which changes both approach and price.
How to tell a good campaign from a bad one
Some practical questions to ask any agency, including us:
Can I see the sites before you place? If the answer is no, ask why. Your brand appears on those pages.
Why this site specifically? There should be a reason beyond "it accepted the post." If the only justification is a metric, the relevance filter is not being applied.
What is the anchor text plan? Repeating the same commercial phrase across every link is one of the more recognisable unnatural patterns.
What happens if you cannot find good placements this month? The honest answer is "we place fewer." An agency contractually committed to a number will eventually hit that number with whatever is available.
What to expect, realistically
Link building is slow. Links take time to be crawled, and their effect accumulates rather than arriving. A campaign that has been running two months has usually not yet shown what it can do.
It is also not sufficient on its own. Links raise the ceiling on what a page can rank for; they do not make a thin page relevant. Spending exclusively on links while the content underneath is weaker than everything above it tends to plateau quickly — a common and expensive mistake.
And nobody can guarantee a position. Rankings are decided against competitors who are also investing, using a system neither of you controls. Any guarantee of a specific ranking is either misunderstanding the mechanism or misrepresenting it.
The short version
Link building is the practice of earning references from other websites so search engines have external evidence your pages deserve to rank. It still works because it is expensive to fake. It works best when placements are relevant, on sites with genuine readers, in content where the link makes sense.
Judge a campaign by the sites it puts you on, not the number in the report.
Written by Kavin Rajan, Founder & SEO Specialist at RankForge Digital.
