Link building is acquiring hyperlinks from external websites pointing to your site. Search engines treat these inbound links as endorsements—the more authoritative sites linking to you, the more credible your site appears for ranking purposes. This remains one of Google's core ranking factors despite algorithm changes over the past decade. Quality trumps quantity. A single link from a government site (.gc.ca) or major university (.edu) carries more weight than fifty links from low-authority blog networks. Relevance also matters—a link from an industry publication in your niche passes more value than one from an unrelated site. Link building works because Google's PageRank algorithm still distributes authority through the web graph, even though they've added hundreds of other signals since 2003. Common link building methods include guest posting on industry blogs, creating linkable assets like original research or tools, digital PR to earn media mentions, broken link building where you replace dead links with your content, and relationship-based outreach to site owners in your space. At Ottawa SEO, we focus heavily on creating genuinely useful content that earns links naturally, then amplifying it through targeted outreach to relevant Canadian publishers and industry sites. The main risks involve manipulative tactics. Buying links, participating in link schemes, or using automated outreach at scale can trigger Google penalties that tank your rankings overnight. The 2012 Penguin update specifically targeted these practices, and manual actions still get issued regularly. We've seen Canadian e-commerce sites lose 70-80% of their organic traffic after purchasing link packages from overseas agencies. Effective link building now requires genuine value exchange. You need content worth linking to, relationships with site owners, or newsworthy angles that journalists want to cover. It's slower than it was in 2010, but clean link profiles built this way withstand algorithm updates and compound in value over years rather than creating cleanup work down the road.