If you’ve spent any time reading about SEO, you’ve run into the word “backlinks” within the first few sentences — usually described as important without much explanation of why. Backlinks are simply links from one website pointing to a page on another website. That definition sounds almost too simple to matter, but backlinks remain one of the strongest ranking signals search engines use, more than two decades after Google first built its algorithm around counting them.
Why Backlinks Matter So Much
Search engines need a way to judge which pages are trustworthy and worth ranking highly, beyond just analyzing the words on the page itself. Backlinks function as a kind of vote of confidence — when one website links to another, it’s implicitly saying “this content is worth pointing my visitors toward.” A page earning links from many different, reputable websites is, in Google’s estimation, more likely to be genuinely valuable than a page nobody else references.
This is why two pages can target the identical keyword, with similarly well-written content, and rank very differently — the page with a stronger backlink profile typically wins, all else being roughly equal.
Not All Backlinks Are Equal
A link from a well-established, topically relevant website carries meaningfully more weight than a link from an obscure, unrelated site. Several factors determine a link’s value:
- Authority of the linking domain — a link from a respected industry publication carries more weight than one from a low-quality directory
- Topical relevance — a link from a site covering a related subject matters more than an off-topic link, even from a reasonably authoritative source
- Placement — a link within genuine editorial content typically counts more than one buried in a footer or sidebar
- Anchor text — the clickable text of the link gives search engines additional context about what the linked page is about
- Follow vs nofollow — a “nofollow” attribute tells search engines not to pass ranking credit through that link, though it can still drive referral traffic and brand visibility
The Difference Between a Good Link and a Risky One
Not every link-building tactic is safe. Google’s guidelines explicitly prohibit manipulative link schemes — buying links purely for ranking purposes, participating in large-scale link exchanges, or using automated tools to generate links at scale. Sites caught engaging in these practices risk a manual penalty that can devastate rankings overnight.
A good link is earned because the content genuinely deserved the reference — through original research, a uniquely useful resource, or a relationship built through legitimate outreach. If you’re evaluating outside help for link building, understanding which tactics carry penalty risk is essential before hiring anyone promising fast results, since “fast” and “safe” rarely go together in this specific area of SEO. Our guide to choosing a safe link building service covers fair pricing, red flags and how to vet a vendor.
How Search Engines Discover and Evaluate Links
Search engine crawlers continuously follow links across the web, building a map of how pages connect to each other. When evaluating a page’s authority, algorithms consider the total number of unique referring domains (not just total links, since many links from one low-value site matter less than a handful from several respected ones), and increasingly, the actual traffic and engagement those referring pages themselves receive — a signal that a link is coming from a genuinely active, valued page rather than an abandoned or spam-adjacent one.
Common Ways to Earn Legitimate Backlinks
Sustainable link-building approaches include publishing genuinely original research or data that other sites want to cite, digital PR (pitching a compelling story or data point to journalists and industry publications), guest contributions to respected industry sites, and simply creating content thorough and useful enough that other creators naturally reference it when covering the same topic. These approaches take longer than shortcuts, but they don’t carry the penalty risk that manipulative tactics do.
How Many Backlinks Does a Page Need?
There’s no universal number — competitive, high-value keywords in crowded industries often require dozens or hundreds of quality referring domains to compete, while low-competition, niche topics can rank with just a handful of relevant links, or sometimes none beyond the site’s own internal linking. Checking what pages currently ranking for your target keyword have earned gives a realistic benchmark for what your own page needs to compete.
Understanding backlinks is foundational to nearly every other SEO topic — technical SEO, content strategy, and local SEO all eventually connect back to how a page earns and passes authority through links. Getting comfortable with this concept early makes the rest of SEO significantly easier to reason about.
Anchor Text: Getting the Balance Right
The clickable text of a backlink gives search engines context, but over-optimizing it — aggressively using exact-match keywords in every link pointing to a page — can look manipulative and has historically triggered algorithmic penalties. A natural link profile includes a mix of anchor text types: the brand name, the naked URL, generic phrases like “click here” or “this resource,” and only occasionally an exact-match keyword phrase.
Sites that earn links naturally, through genuine outreach and content people want to reference, tend to end up with exactly this kind of varied, natural-looking mix without any deliberate engineering — because different people linking to the same page naturally describe it in different words.
Checking Your Own Backlink Profile
Tools like Ahrefs, Semrush, and Google Search Console (free, though more limited in scope) let site owners see which pages are currently linking to their domain. Reviewing this regularly serves two purposes: identifying genuinely harmful spam patterns worth addressing, and — more usefully for most sites — understanding which of your own content is naturally earning links, so you can create more of what’s already working.
Before you start earning links, make sure search engines can crawl and index the pages you want them to point to. Our technical SEO service checks that for you.
What Are Backlinks: Frequently Asked Questions
Do internal links count as backlinks?
No. Backlinks specifically refer to links from a different website. Internal links — links between pages on your own site — serve an important but separate purpose: helping search engines and users navigate your site’s structure and understand which pages you consider most important.
Can too many backlinks hurt a website?
Volume alone doesn’t cause harm, but a sudden, unnatural spike in low-quality links — especially from clearly spammy or unrelated sites — can trigger algorithmic scrutiny or a manual review. A gradual, natural-looking growth pattern from relevant sources is safer than an artificial burst.
How long does it take for a new backlink to affect rankings?
Search engines need to first discover and crawl the linking page, which can take anywhere from a few days to several weeks depending on how frequently that site gets crawled. Once discovered, the ranking impact isn’t usually immediate either — it typically takes additional weeks to fully factor into rankings.
Should I disavow bad backlinks pointing to my site?
Only if you’ve identified a genuinely harmful, manipulative pattern of links (often from a past bad SEO campaign or negative SEO attack) and have reason to believe it’s actively hurting rankings. Most naturally occurring low-quality links that appear over time don’t require action — search engines are generally capable of ignoring irrelevant or low-value links without any harm to the site being linked to.
