What Is a Backlink in Off Page SEO? A Plain Explanation With Real Numbers

The short version: a backlink is a link on someone else's website that points to yours, and in off page SEO it acts like a vote of trust that Google counts when deciding how to rank your site. Not all votes count the same. One link from a trusted, relevant site can outweigh fifty links from low quality directories, and I've watched that play out with my own clients more times than I can count.

What a backlink is, in plain terms

A backlink is any hyperlink sitting on another website that leads back to a page on yours. If the BBC writes a piece about small business trends and links to a report on your site, that's a backlink. If a blogger reviews your product and links to your homepage, that's a backlink too. Simple as that.

The word "off page" is doing a job here. It separates backlinks from on page SEO, which is everything you control directly on your own site: your titles, your headings, your content, your page speed. Backlinks live outside your control entirely. You can't force another website owner to link to you (well, you can try, and I'll get to why that often backfires), which is exactly why Google treats them as one of the strongest trust signals it has.

Think of it like a reference in a job application. You can write whatever you want about yourself on your CV. But when someone else vouches for you, unprompted, that carries more weight. Backlinks work the same way for a website.

How I first understood this, and got it wrong for years

Back when I was running my own agency in the early days of content marketing, I treated backlinks as a numbers game. Build enough links, any links, and rankings would climb. We had a spreadsheet tracking hundreds of links from directory submissions, blog comment sections, forum signatures. It felt productive. It moved almost nothing.

Then one guest piece I wrote landed on a well known marketing publication, the kind of site journalists themselves read, and it included a single link back to a page on my own site. Within about six weeks that page moved from page four of Google to the first page for its target term. One link did more than the previous eighteen months of directory submissions combined. That's when it clicked for me: it was never about the count, it was always about who was linking and how relevant they were to my subject.

I still tell that story to clients now, because most of them arrive with the same instinct I had: chase volume. If you want the full mechanics of why that one link moved the needle and a hundred others didn't, I've broken it down on why backlinks matter so much for your website's ranking.

Here's a free trick on how to find backlinks using Google with nothing but search operators.

The uncomfortable bit nobody likes to say out loud

Here's the part that makes SEO agencies twitchy: most of the backlinks sitting on your site right now are probably doing nothing. Not harming you, just sitting there inert. A backlink only passes meaningful value if the linking page itself has authority, is indexed by Google, gets some traffic or trust of its own, and links to you in a way that's contextually relevant. A link buried in a directory that nobody visits, sitting on a page Google barely bothers to crawl, is close to worthless.

Agencies rarely say this because "we built you 200 backlinks this month" sounds a lot better in a report than "we built you three good ones." But three good ones is what moves rankings. I'd rather see a client with forty backlinks, all from real, relevant, moderately trafficked sites, than a client with four thousand backlinks scraped together from low quality directories and forum profiles. Google's own algorithm updates over the past decade, particularly the Penguin update back in 2012 and the link spam updates since, were built specifically to punish that second pattern.

What makes a backlink strong versus weak

Not every link is worth the same, and this is the part worth understanding rather than skimming past.

• Authority of the linking site. A link from a site Google already trusts, a national newspaper, a well established industry blog, a university page, carries more weight than a brand new blog nobody's heard of.
• Relevance. A link from a marketing blog to your marketing agency site matters more than a link from an unrelated gambling forum or a random recipe site.
• Placement on the page. A link inside the main body of an article, surrounded by relevant text, is worth more than a link buried in a footer or sidebar.
• Follow versus nofollow. A "dofollow" link passes ranking value directly. A "nofollow" link, often used on comment sections, forums, and some press sites, tells Google not to pass that value on, though it can still bring referral traffic and visibility.
• Anchor text. The clickable words themselves matter. A link on the phrase "email marketing tips" tells Google something different than a link on the word "here."

If you want to see this laid out with actual screenshots and worked examples rather than theory, I wrote a whole piece on what a backlink is and what one looks like, which is worth a look if you've never seen the difference between a strong and weak link side by side.

A simple step by step for checking whether your own backlinks are any good

You don't need an expensive tool to get a rough sense of this. Here's what I walk clients through:

• Pull a list of your current backlinks. Google Search Console gives you this for free under "Links," though it's limited and slow to update.
• Visit each linking page yourself and check it's still live. Dead pages, and pages that redirect somewhere odd, are common and worth pruning from your mental list.
• Check whether the linking site looks like something a real person would visit. If the design looks like it was built in 2009 and abandoned, and the content is thin, that link is likely doing very little.
• Note whether the link sits within actual article content or is stuffed into a sidebar, footer, or an "our partners" style page.
• Search for the exact anchor text plus your brand name to see if the page ranks or gets any visible traffic itself.

I've written a longer, more methodical version of this process, including what to do with the results, in how to track backlinks over time without a paid tool, which is one of the more practical guides I've put together because it assumes you're not going to spend three hundred pounds a month on software just to check this.

Where off page SEO fits into the bigger picture

Off page SEO isn't only backlinks, though backlinks are the biggest part of it by a wide margin. It also covers things like brand mentions without a link (Google can still pick up on those), social signals, reviews on sites like Google Business Profile and Trustpilot, and digital PR generally. But if you strip off page SEO down to one core mechanism, it's this: other websites vouching for yours through links, and Google reading that as evidence you're worth ranking.

On page SEO, by contrast, is everything happening on your own site. Your title tags, your internal linking structure, your page speed, your content quality. Both matter. But you can have flawless on page SEO and still get outranked by a competitor with a scrappier website and three excellent backlinks from trusted sources. I've seen that exact scenario play out for a client in the legal sector, whose competitor with objectively worse content outranked them for two years, purely on the back of a handful of links from national press coverage they'd earned through a well timed comment piece.

How backlinks get built, without the shortcuts

There's no shortage of people selling "guaranteed backlinks" in bulk, usually for suspiciously low prices. Almost all of these are worthless at best and dangerous at worst, because Google's spam detection has gotten far better at spotting patterns of paid, low quality links, and can apply what's called a manual action penalty that tanks your visibility overnight.

What works instead is slower and less glamorous:

• Writing something useful enough that other sites want to reference it, a proper original piece of research, a data set, a strong opinion piece.
• Digital PR: pitching journalists a story, a stat, or a comment when something newsworthy happens in your industry.
• Guest contributions on relevant, established publications, written rather than as a thinly disguised advert.
• Building relationships with people in your industry who naturally reference your work because they respect it, not because you asked once and never spoke to them again.

I go through this whole process, including the outreach templates I still use myself, in how to build backlinks for your website the right way. It's slower than buying a package of two hundred links off Fiverr. It's also the only version of this that survives an algorithm update.

If you're weighing up whether to bring in outside help for this rather than doing it in house, it's worth reading what a proper AI consultant for small business can realistically do around content and digital PR strategy versus what you can manage yourself with a spare afternoon a week.

Why the number on a backlink checker can mislead you

Plenty of business owners open a backlink checker, see a big number, and assume they're in good shape. That number often includes broken links, links from sites that no longer exist, and links that were nofollow all along and never passed any value. It's not that the tools are lying to you, it's that the headline metric they show first is rarely the one that matters. I've broken down exactly what these tools show and what they conveniently leave out in what a backlink checker really shows you (and what it hides), which is worth reading before you trust any single number as proof your off page SEO is working.

See also Sites That Accept Guest Posts: Real Lists, Real Pay, and What Gets You Published.

The free backlink checker does the working out for you.

If you write on this topic, see guest post guidelines for SEO writers.

If it helps to see them, here are real backlink examples, good and bad.

If you'd like this done for you, see my UK SEO consultant page. Want someone to handle it? Start with my done-for-you SEO page.

Frequently asked questions

What is the difference between a backlink and off page SEO?

A backlink is one specific thing: a link from another site pointing to yours. Off page SEO is the broader category of activity, mostly built around earning backlinks, but also including brand mentions, reviews, and digital PR that happens away from your own website.

How many backlinks do I need to rank?

There's no fixed number, and chasing one is the wrong instinct. A handful of backlinks from relevant, trusted sites will usually outperform hundreds from low quality directories. I've seen single well placed links from national publications move a page from position forty to position six within weeks.

Are nofollow backlinks worth anything?

Yes, though not in the direct ranking sense. A nofollow link tells Google not to pass ranking value through it, but it can still bring real visitors, build brand awareness, and occasionally get picked up as a trust signal indirectly. Don't chase them on purpose, but don't panic if some of your links are nofollow either.

Can buying backlinks get my site penalised?

Yes, and it happens more often than people expect. Google's algorithms and manual review teams actively look for patterns of paid, low quality, or unnatural links, and a manual action penalty for this can remove your site from search results almost entirely until the links are disavowed or removed. It's rarely worth the shortcut.

Writers who cover this topic can browse guest posting sites for SEO before pitching.

Sources worth reading

• Google Search Central documentation
• Google's spam policies