SEO stands for Search Engine Optimization. It refers to the practice of optimizing a website or online content to improve its ranking and visibility on search engine results pages (SERPs).

The goal of SEO is to increase organic (unpaid) traffic to a website by improving its search engine ranking for relevant search terms or keywords. This is done through a combination of on-page optimization (such as optimizing content and metadata) and off-page optimization (such as building quality backlinks from other websites).

By improving the visibility of a website on search engines like Google, Bing, and Yahoo, SEO can help businesses attract more qualified traffic and leads, increase brand awareness, and ultimately drive more conversions and revenue.