Technical SEO is the process of optimizing a website's technical aspects to improve its visibility and ranking on search engine results pages (SERPs). This includes optimizing the site's structure, performance, and code to make it easier for search engines to crawl, index, and understand the content. 

Technical SEO also involves ensuring that the website is mobile-friendly, has a fast loading speed, and provides a good user experience. By addressing these technical aspects, a website can improve its ranking on SERPs, drive more organic traffic, and ultimately increase its chances of converting visitors into customers.