Backlinks are off-page SEO. They're the single most important off-page ranking factor because they exist entirely outside your website's control, on someone else's domain. When another site links to yours, it's essentially vouching for your content's credibility, which Google interprets as a trust signal. Off-page SEO encompasses everything that happens away from your own site to influence rankings. Backlinks typically account for 60-70% of off-page value in competitive niches, but the category also includes unlinked brand mentions, social media shares, local citations (especially Google Business Profile optimization), guest author profiles, and overall domain reputation across the web. That said, backlinks deliver the measurable, algorithmic impact that moves rankings. The quality hierarchy matters more than raw numbers. A single contextual link from a DR70+ government site or national publication will outperform fifty directory submissions. We track domain authority, topical relevance, anchor text diversity, and referring domain freshness. A tech startup getting linked from TechCrunch or BetaKit carries more weight than a hundred blog comments. Google's algorithms, particularly PageRank derivatives and the current helpful content systems, fundamentally rely on link graphs to determine authority. They analyze not just the links pointing to you, but the links pointing to those linking sites, creating a complex web of trust. This is why link building remains the hardest part of SEO to execute, you're dependent on earning editorial approval from third parties. At Ottawa SEO, we prioritize backlinks within our off-page strategy but never isolate them. We build links through content partnerships, digital PR, and strategic outreach while simultaneously managing brand reputation and securing unlinked mentions. The distinction matters for reporting and resource allocation, but in practice, effective off-page SEO treats backlinks as the anchor point around which other signals cluster. If you're doing off-page work and ignoring backlinks, you're leaving 70% of potential impact on the table.