A backlink is simply a link from one website pointing to another. When Site A links to Site B, Site B has gained a backlink. Search engines treat these links as endorsement signals—if multiple authoritative sites link to your page, algorithms interpret that as evidence your content is trustworthy and relevant. Not all backlinks carry equal weight. A link from the CBC or Globe and Mail holds more authority than one from a newly registered blog with no traffic. Google's algorithm evaluates the linking site's domain authority, topical relevance, and whether the link appears in actual editorial content versus a footer or sidebar. A backlink from a Canadian government site ending in .gc.ca typically carries substantial weight for locally relevant queries. Backlinks work because they're harder to manipulate than on-page factors. You control your own title tags and content, but earning links from independent third parties requires creating something genuinely useful. That's why link building remains the most time-intensive part of SEO—you're convincing other site owners to vouch for you. The anchor text matters too. If ten sites link to your Ottawa law firm using the phrase "Ottawa personal injury lawyer," search engines connect that phrase to your site's expertise. Natural link profiles show variation—branded anchors, naked URLs, and generic phrases like "click here" mixed with exact-match keywords. At Ottawa SEO Inc., we've seen sites ranking on page three jump to page one after acquiring 15–25 relevant backlinks from industry blogs, local news mentions, and resource pages. Conversely, we've watched penalties hit sites that bought hundreds of low-quality directory links. Quality beats quantity every time. One link from a domain authority 60+ site often outperforms twenty links from DA 10–20 sources. The backlink profile becomes your site's external resume. Search engines crawl these connections constantly, updating their understanding of which sites deserve to rank for competitive terms. Building that profile ethically takes months or years, but it's the foundation of sustainable organic visibility.