It’s hard to improve SEO without understanding the fundamental role of backlinks! This comprehensive guide reveals the secrets of backlinks, the real votes of confidence that propel your web page up the Google search results. Discover how to identify quality backlinks, avoid the pitfalls of toxic links and implement an effective SEO strategy to boost your traffic, web popularity and web credibility. What is a backlink? A backlink is simply a link to a website (website B) from another website (website A). Its main purpose is to connect two websites – making navigation easier for Internet users, but also for search engines. Backlinks play a decisive role in Google’s algorithm and contribute to a domain’s authority. In fact, you can think of each backlink as a “vote of confidence”. The more quality links your site receives from high-authority websites, the more credibility it gains with Google. The authority of the site making the link has an important impact. A link from an authoritative site transmits more “SEO juice” than a link from a less influential site. Google therefore evaluates link quality by analyzing various aspects – the authority of the source site, the relevance of the link, the anchor text and the editorial aspect of the link. Google gives priority to links acquired naturally, i.e. through the creation of quality content that brings real added value. Given that backlinks remain one of Google’s most important criteria, they deserve special attention. Backlink evaluation and challenges Criteria for a good backlink To evaluate a good backlink, five key indicators need to be taken into account : authority, relevance, traffic, context and link age. Domain authority can be measured with tools such as Ahrefs or Semrush. Backlink Characteristics Comparison Features Good Backlink Bad Backlink Domain authority Trust Flow (TF) high (30 and over), Domain Rating (DR) high (20 and over) Trust Flow (TF) low (below 30), Domain Rating (DR) low (below 15) Thematic relevance Comes from a website whose theme is related to yours Comes from a website whose theme is not related to yours Link context Naturally integrated into high-quality editorial content Artificially placed, often in footer, sidebar or spam comments Link anchor Consistent with target page content, including main keyword if possible Generic (“click here”), over-optimized (exact match of keyword) or irrelevant anchor Link location In the main content of the page, on a page that is itself well referenced In the footer, sidebar or an inconspicuous section of the page Content quality Original, informative, well-written content with high added value for the user. Duplicated, low-quality, uninformative or auto-generated content Type of link Naturally acquired backlink Backlink resulting from abusive “netlinking” techniques (link buying, automated links, etc.) Legend: This table compares the characteristics of good and bad backlinks. The Trust Flow (TF) and Domain Rating (DR) metrics are used to evaluate domain authority. A good backlink makes a positive contribution to SEO, while a bad backlink can lead to penalties. The quality of backlinks has a direct impact on search engine positioning. Artificial links are risky; black hat SEO techniques can lead to Google penalties. An algorithmic penalty can be felt very quickly – sometimes even overnight. If you find yourself in this situation, analyzing your backlinks is a priority. Risks of toxic links Spam links are links from link farms, adult sites or illegal content. These links are dangerous for your website, as they can harm your SEO. There are a number of SEO audit tools and solutions available to find out if your website is receiving toxic links for which you are not responsible. Manual and algorithmic penalties can have disastrous consequences on organic visibility. A notification in Google Search Console is a sign of manual action. This means that Google has not been able to determine whether your links are spam (which it claims to know how to ignore) or artificial links created by you. So you need to go through your link profile with a fine-tooth comb. To find out more about White Hat SEO techniques and best practices for optimized SEO, read our complete guide. Acquisition strategies There are many legitimate methods of acquiring backlinks, such as guest blogging, viral content creation and industry partnerships. Here are a few tried-and-tested techniques for generating natural backlinks and improving your SEO. Create quality content: Develop informative, relevant and original blog posts, guides, infographics and videos that naturally attract links from other websites; exceptional content is the basis of a successful netlinking strategy. Guest blogging: Write guest articles for relevant blogs and websites in your niche, including links to your own website in the body of the article or in your author biography; this acquires contextual backlinks and gains visibility with a new audience. Participate in discussions: Find forums and online communities relevant to your industry and actively participate in discussions by providing useful answers and including links to your website where appropriate: it’s a great way to get targeted backlinks and establish your expertise. Digital public relations (PR): Build relationships with journalists and influencers in your industry and offer them exclusive content, case studies or interviews; mentions in the media and on influential blogs can generate quality backlinks and increase brand awareness. Acquire contextual backlinks: Identify obsolete web pages and broken links on sites in your industry and contact webmasters to offer to replace these links with links to your updated, relevant content. This is an effective strategy for acquiring contextual backlinks and improving the user experience. By implementing these proven techniques, you can generate natural backlinks, improve your SEO and increase traffic to your website. A sustainable strategy relies on a regular acquisition rate, anchor diversification and a dofollow/nofollow mix; the ideal ratio of followed/unfollowed links depends on your current link profile, but it’s important to avoid overoptimization – a healthy anchoring strategy, with a variety of anchor text, contributes to a more natural link profile. The importance of local backlinks For physical businesses, geolocated links are important. Local directories must therefore be optimized, as this