NGINX is open source high performance HTTP server with reverse proxy with cache for Apache.
By default mostly all Linux server use APACHE to run the websites. Apache have drawback about high memory usages.
NGINX using the reverse proxy method and serve as a static web server . So both Apache and NGINX give better performance.
Apache process per connection model and NGINX is an asynchronous event driven architecture. NGINX is faster to serve static content and consume less memory. Its not serve the dynamic content.
Login into your WHM panel and search Nginx Management . Here you press install button to run Nginx.
Users tab will show you the account which one is using the Nginx and even you clear the cache of any account.
After some time your website content showing old or outdated content of website. To clear this below are the points how to do it.