What is SEO, and why is it important for websites?

SEO, or Search Engine Optimization, is the practice of optimizing a website to enhance its visibility and ranking on search engine results pages (SERPs). The primary goal is to increase organic (non-paid) traffic to the site. SEO encompasses a range of techniques and strategies, including keyword optimization, content creation, link building, and technical optimizations, all aimed at improving a website's relevance and authority in the eyes of search engines like Google, Bing, and Yahoo.