Search Engine Optimization: Definition and evolution

Search Engine Optimization (SEO) refers to the techniques used to improve the visibility of content within organic, unpaid search engine results. While historically dominated by Google, modern SEO has evolved into a broader strategy for online presence. Users now seek information across diverse platforms, including YouTube, TikTok, Instagram, LinkedIn, Amazon, and AI-driven conversational assistants like ChatGPT, Gemini, and Claude.

Effective SEO relies on three core pillars: technical optimization, content relevance, and site authority. Search engines typically operate through a three-step process involving crawling web pages, indexing them in a massive database, and ranking them based on how well they match user queries. Unlike paid advertising, SEO requires an investment of time and effort rather than per-click costs, offering long-term visibility once high rankings are achieved.