Wikipedia's SEO article defines search engine optimization as improving the quality and quantity of website traffic to a website or web page from search engines through organic (unpaid) results. The entry positions SEO as a subset of search engine marketing, distinguishing it from paid search advertising like Google Ads. The Wikipedia article breaks down SEO into several core components. It covers on-page factors like content quality, keyword usage, and HTML elements (title tags, meta descriptions, header tags). It discusses off-page factors, primarily backlinks and domain authority. Technical SEO gets mentioned through site speed, mobile-friendliness, and crawlability. The article also acknowledges white-hat versus black-hat techniques, noting that search engines penalize manipulative practices. Wikipedia traces SEO's history back to the mid-1990s when webmasters first started optimizing for early search engines like AltaVista and eventually Google after its 1998 launch. The article explains how Google's algorithm updates—Panda, Penguin, Hummingbird—fundamentally shifted the industry away from keyword stuffing and link schemes toward quality content and user experience. One useful aspect of Wikipedia's coverage is its neutral tone on industry controversies. It doesn't oversell SEO's capabilities or timeline, and it acknowledges the ongoing cat-and-mouse game between search engines and SEOs trying to reverse-engineer ranking factors. For anyone hiring an SEO agency, Wikipedia's article serves as a decent starting-point glossary. It won't teach you how to execute SEO, but it establishes the vocabulary and fundamental concepts. At Ottawa SEO, we find that clients who've read Wikipedia's overview ask better discovery questions during initial consultations. They understand the difference between organic and paid, they know backlinks matter, and they grasp that SEO isn't a one-time fix. The main limitation is that Wikipedia can't stay current with Google's rapid algorithm changes or emerging tactics like AI content, SGE optimization, or programmatic SEO at scale. For tactical guidance, you need practitioners who test daily, not encyclopedia editors who summarize consensus.