Search Engine Optimization (SEO) is the practice of improving a website's visibility in organic (unpaid) search results by making it more relevant and trustworthy in the eyes of search engine algorithms. SEO encompasses three interconnected disciplines: technical SEO (site speed, crawlability, structured data markup, mobile-first indexing), on-page SEO (content quality, keyword intent alignment, internal linking), and off-page SEO (backlinks, brand mentions, and third-party signals). The goal of SEO is not to trick search engines but to genuinely satisfy the intent behind a user's search query — earning prominent rankings as a byproduct of building the most useful, authoritative resource on the topic. Google processes over 8.5 billion searches per day, making organic search one of the highest-ROI marketing channels available to businesses of all sizes, because unlike paid advertising, well-earned rankings continue delivering traffic without ongoing per-click spend.
Glossary entry