NGINX is a high-performance web server and reverse proxy built for scale, using an event-driven architecture to handle high concurrency with low overhead.. NGINX is used for traffic routing, load balancing, and caching in modern apps—especially across cloud-native and Kubernetes environments.. NGINX is an open source project under Apache License 2.0. For information about contributing to the project, visit github.com/nginx. To connect with the NGINX community, visit community.nginx.org.