SEO 101 provides an overview of search engine optimization (SEO) basics. SEO involves optimizing websites to increase their visibility in search engines like Google. It matters for business because online visibility drives online leads and sales. SEO works by having search engine spiders crawl websites and index them, then serving relevant results based on keywords. Key components of an SEO campaign include keyword research, on-page optimization of titles and content, off-page activities like link building, and analyzing results.