SEO (Search Engine Optimization) is the process of optimizing a website or online content to improve its visibility and ranking on search engine results pages. This can include techniques such as keyword research, meta tags, backlinking, and content creation. An SEO intro video would likely provide a brief overview of these concepts and explain how they can be used to improve a website's search engine performance. The video may also introduce the viewer to common tools and best practices used in SEO.