The evolution of SEO has marked significant milestones, shaping digital landscapes. Initially, the focus was on keyword density and meta tags. The introduction of Google's PageRank algorithm revolutionized relevance, emphasizing quality content. Mobile optimization became pivotal with the surge in mobile usage. Algorithm updates, like Panda and Penguin, penalized low-quality content and manipulative link building. The rise of voice search and AI further transformed search dynamics. User experience gained prominence, leading to mobile-first indexing. E-A-T (Expertise, Authoritativeness, Trustworthiness) became crucial, emphasizing content credibility.