Links on websites other than your own that go back to a page on your website. Backlinks are also called inbound links because they represent another website’s traffic coming to your own site. The quality and quantity of your backlinks can help you rank higher in search engines such as Google and Bing. This is because your backlinks are considered an indicator of how popular your website is with users. Implementing, managing, and analyzing the performance of backlinks is an important aspect of search engine optimization (SEO) and SEO strategies.
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is a process of creating content that helps search engines (and users) understand what your website is about. Off-site optimization is about demonstrating to search engines that your content offers value to third parties. And the most important value statement is a backlink.
Individual documents on the web interconnect via links—they’re the glue that holds the web together. Internal links are links between web pages on the same domain, and they primarily exist to help people navigate the website. External links connect to web pages on other domains and have a wider range of possible intentions.
In each case, the link is on the page to provide additional value to the reader, so the outgoing link is a valuable asset. It’s key to understand that the link has a direction. When it’s outgoing on the linking webpage, it’s incoming to the target page. Therefore, this is a backlink to the target page.
Search engines recognize that the backlink has value and reward the target URL, interpreting the link as fully intentional; they assume there’s been some level of editorial assessment of the target webpage.
That’s why backlinks that point to your website indicate to search engines that your content has value. In fact, backlinks are one of the most powerful ranking factors. They play a huge role in the success (or failure) of every website when it comes to organic search traffic.
One of the main reasons Google is the dominant search engine is because it was the first to realize the importance of backlinks. When Google launched in 1998, it used a web pages based on link popularity—meaning a page ranks higher if there are more links to it.
This algorithm, named “PageRank” after Larry Page (co-founder of Google, along with Sergey Brin), doesn’t just compute the number of links a given webpage receives; it also measures the authority of those links.
This means that not all backlinks are equal. Imagine one of the pages on your website has a backlink from 2 web pages on different external domains:
If these 2 pages were about the same topic, Page A would likely rank higher than Page B. This is because Page A would be more authoritative due to the fact that it has 10 times as many links.
In terms of these 2 backlinks to your site, the link from Page A is more valuable than the link from Page B because it has a higher authority.
Essentially, the PageRank algorithm assigns an authority value to each webpage based on the quantity and quality of its incoming links.
PageRank is an iterative algorithm. This means the data gets computed, feeds back into itself, and then needs to be rerun through many iterations before it stabilizes.
This is because the relative authority of all the pages in a given network depend on one another. For example, imagine a network of 4 pages.
In order to calculate the authority passed to Page D, we first need to know the authority of Page B and Page C. But the authority of Page B is dependent on Page A and Page C, and the authority of Page A itself is dependent on Page B.
You can see how even a simple network can become complex quickly. It’s only by iterating through the calculations again and again that the solution presents itself. The math is not that complicated, but the size of the dataset (the trillions of links across the entire internet) and the amount of computation required make it a huge task.
Domain authority describes the mini-network of URLs and links that exist on your own site. As with backlinks from external sites, internal links within your own site also pass authority from one URL to another.
It makes sense that links from big brand websites have more domain authority than links from small local businesses. For example, a link from a page on CNN is valuable because CNN is an authoritative website. Lesser-known websites have less authority.
If your homepage gets backlinks from a local news website, this boosts the authority of your homepage. But since it also links out to other pages on your site, some of this authority distributes to the pages linked to from your homepage. With this authority boost, the authority is also shared among the pages that they link to. So incoming backlinks from external sites eventually trickle through the internal link architecture across your whole site. The closer to the top of the chain, so to speak, the more link authority they receive.
This is how big brands can dominate the market for certain sets of search terms. The power of their domain, and smart internal linking practices, can mean that even brand new pages rank well.
Although accurately calculating the exact value of link authority is a very opaque and complex task, knowing how PageRank works provides some basic rules of thumb.
In short, you want both quality and quantity when it comes to backlinks.
The other important factor when it comes to backlinks is relevance. In addition to calculating the authority of a backlink to your website, Google is also looking at the relevance of the link—does the topic of the link, page content, or website match the topic of the link target?
Imagine you have a website that sells musical equipment, and you have a web page selling guitar picks linked to from 3 different websites:
In this case, the anchor text doesn’t pass any relevance signals, but the web page and the website do, making this a relevant link.
For Link 2, there are no relevant signals. In fact, the link seems so irrelevant that Google might attach no value to it at all, despite it being from an authoritative website.
In Link 3’s example, the website, web page, and anchor text are all relevant. Despite being on a less authoritative website, this is a valuable link as it passes clear relevance signals.
You can end up with backlinks from many different sources. Some of them are from seemingly irrelevant websites, and in general, these neither help nor hurt you. The links that will help you the most are highly relevant, as this gives a much clearer signal to Google that your site is a good match for a particular topic.
Once you’ve done what you can for on-page optimization, building backlinks to your site is the most valuable thing you can do to improve your rankings.
Unfortunately, it’s one of the most difficult tasks in SEO. To get a link, you need to convince someone else that they can improve a web page on their site by linking to a web page on your site.
It’s inadvisable to email random people and ask them to link to you. Instead, there are more professional best practices to get backlinks to your site.
Link building is the process of actively acquiring backlinks. It’s a niche specialty of SEO that takes a lot of practice.
When you’re getting started, however, it’s sufficient to understand the value of links and engage in activities that have the potential to generate backlinks. After all, linking to other web pages is a fundamental part of what makes the web what it is.
The bigger concern is the inverse—if you don’t engage in any activity that could drive backlinks, you’re giving yourself a very slim chance of improving your search rankings.
Link building is a process that requires some trial and error.
Essentially, backlink generation happens in one of 2 ways.
Either way, you need to reach people with your content. There are many different approaches you can take to do so. What ends up being the most effective will depend on the type of content on your website, the type of people and businesses that might link to you, and how you might get them to look at your site.
With all these ideas, you should never pitch someone asking them to link to you. The link is a natural byproduct of the mention or feature. The idea is that you partake in activities where backlinks are a potential outcome. The best ideas are ones that offer business value even when you don’t get the backlink.
The cornerstones of SEO are on-page optimization, and acquiring backlinks. Doing one without the others will hamper your results. But among these, acquiring backlinks is probably the most important. Links are not just good for SEO. They can also be good for creating awareness and driving traffic. Link building should be a major part of your SEO strategy.