Internal linking is when you hyperlink from one page on your domain to another page on the same domain. For example, linking from your homepage to a service page, or from a blog post to a related case study. External linking works in two directions: outbound links from your site to other domains (like citing a study or linking to a tool), and inbound links from other sites pointing back to yours (backlinks). Internal links serve three purposes. They let visitors navigate between related content without hitting back or searching again. They distribute page authority across your site, so strong pages can pass ranking power to newer or deeper pages. And they give Google's crawler clear pathways to discover and index every page, especially ones buried three or four clicks deep. A solid internal linking structure often means your category pages, pillar content, and conversion pages rank higher because they receive more internal equity from blog posts and supporting pages. External linking also plays distinct roles. Outbound links to reputable sources (government data, research papers, industry tools) signal to Google that you're not operating in a vacuum and that your content is well-researched. Inbound links from other domains are the backbone of off-page SEO. When a high-authority site links to you, it acts as a vote of confidence and directly impacts your domain authority and individual page rankings. Quality beats quantity: one link from a .edu or a major industry publication outweighs dozens from low-trust directories. At Ottawa SEO, we treat internal linking as architecture and external linking as reputation. Internally, we map out silos so product pages and service pages get consistent link flow from blog content. Externally, we focus outreach on Canadian business directories, local news outlets, and industry partnerships that carry real referral traffic, not just SEO value. The mistake most sites make is random internal links with generic anchor text and chasing any external link regardless of relevance. Both should be intentional, contextual, and aligned with what users actually need next.