SEO stands for Search Engine Optimization, which is the practice of improving the quality and quantity of traffic to a website from search engines through organic search results. It involves optimizing a website's content, structure, and other factors to make it more visible and relevant to search engine users, with the goal of ranking higher in search engine results pages (SERPs).

SEO encompasses a variety of techniques, including keyword research, on-page optimization, link building, and content creation, among others. By implementing these techniques, website owners and digital marketers aim to increase their website's visibility and drive more organic traffic from search engines, ultimately resulting in increased leads, sales, or conversions.