Website SEO refers to Search Engine Optimization, which is the process of improving a website's visibility on search engines like Google. It involves optimizing various elements of the website, including content, keywords, and technical aspects, to rank higher in search results. SEO is important because it helps increase organic traffic to a website, enhances user experience, builds credibility and trust, and ultimately leads to higher conversion rates. A well-optimized website can attract more visitors, which can result in more sales or leads for a business.