NGINX is a very fast open source Webserver, its faster and more resource-friendly than Apache in most cases and can be used as a web server or a reverse proxy.
Nginx has gained a lot of popularity these days and is responsible for hosting some of the largest and highest-traffic sites on the internet.
Its quicker because it doesn’t need to spawn new processes or threads for each request like Apache does. Hence it also has a low memory foot print. It doesn’t support .htaccess files in its quest for speed and rewrite rules that you would write in .htaccess files for Apache are included in the virtual host configuration files. There could be others like the architecture etc