Search Engine Optimization (SEO) is the practice of optimizing websites to improve their visibility and ranking on search engine results pages (SERPs). SEO involves various techniques, including keyword research, content optimization, improving site speed, and building quality backlinks. The goal is to attract organic traffic by making the website more relevant and accessible to search engines like Google. On-page SEO focuses on optimizing website content and structure, while off-page SEO involves external strategies such as link building. A well-executed SEO strategy helps businesses increase online visibility, drive targeted traffic, and ultimately boost conversions and revenue.