This document discusses how NGINX can be used to improve SEO. It notes that NGINX is fast and efficient, providing caching, gzip compression, and HTTP/2 to increase page load speeds. NGINX also provides easy SSL/TLS encryption configuration and HTTP to HTTPS redirects to ensure secure connections. Additionally, NGINX can inspect user-agents and redirect mobile users to mobile sites for an enhanced user experience. In summary, NGINX is a tool that can improve a website's performance on search engines by optimizing page speed, security, and the user experience.