SEO involves structuring website content so search engines can understand it and rank pages higher in search results. It is part of an effective marketing strategy that focuses on creating high-quality, relevant content to engage users. Key aspects of a successful SEO strategy include optimizing pages for both search engines and humans, driving user engagement through content and offers, and managing an organization's online reputation through positive customer experiences and feedback. The future of search is changing, so SEO must evolve to focus on new channels like mobile, social media, video, and voice assistants to help users find what they need and make purchase decisions.