SEO, or Search Engine Optimization, is the practice of enhancing a website's visibility and ranking on search engine results pages (SERPs). It involves optimizing various elements of a website, such as content, meta tags, and site architecture, to make it more appealing to search engine algorithms. The goal of SEO is to increase organic (non-paid) traffic to a website by improving its relevance and authority in relation to specific search queries. By aligning with search engine guidelines and providing valuable, high-quality content, SEO helps websites attract more visitors and achieve better visibility online.