SEO (Search Engine Optimization) refers to the process of improving a website's visibility and ranking on search engine results pages (SERPs) to increase organic (non-paid) traffic. It involves various strategies and techniques aimed at making a website more attractive to search engines like Google, Bing, or Yahoo.
SEO is an ongoing process, as search engines constantly update their algorithms to deliver the most relevant results to users. Successful SEO can significantly boost a website's traffic and visibility in search results.