What Is Drupal?
Drupal is a free, open-source content management system (CMS) with a large, supportive community. It's used by millions of people and organizations around the globe to build and maintain their websites. You probably use Drupal every day without knowing it, as many top businesses and government organizations use Drupal, like the Government of Australia, Red Cross, Harvard, The Economist, BBC, NBC News, Whole Foods, Cisco, Twitter, and many, many more.
Drupal is open source software released under the GNU Public License. This means it has inherent benefits--cost, flexibility, freedom, security, and accountability--that are unmatched by proprietary software. For example, Drupal is free to download and anyone can modify and extend the platform. This ensures freedom from vendor "lock in" and it empowers users worldwide to monitor Drupal's underlying code for compliance and security issues and fix them quickly.
What is Nginx:
NGINX is open source software for web serving, reverse proxying, caching, load balancing, media streaming, and more. It started out as a web server designed for maximum performance and stability.