Website SEO, or search engine optimization, is the practice of improving a website's visibility and ranking on search engines like Google to drive more organic (unpaid) traffic. It involves technical adjustments to a website's structure, creating high-quality, relevant content that users and search engines can understand, and building the site's authority through external factors like backlinks. SEO aims to make your site a relevant and valuable result for users searching for information, products, or services related to your content.