Technical SEO refers to the process of optimizing a website for search engine crawling and indexing. It involves identifying and fixing technical issues that may be preventing search engines from accessing and understanding a website's content. This includes optimizing website speed and performance, ensuring proper website architecture, improving website security with SSL certification, implementing structured data markup, and ensuring that the website is mobile-friendly and responsive. Technical SEO is an essential aspect of overall SEO strategy as it helps search engines better understand and rank a website's content, ultimately resulting in increased organic search traffic.