Nginx is a high-performance web server, reverse proxy, email proxy, and HTTP cache server. Nginx is open-source software and is distributed under the BSD license. Nginx is used by many websites and services worldwide due to its high performance, stability, and flexibility. Nginx provides a variety of features, particularly excelling in serving static content, reverse proxying, load balancing, SSL/TLS encryption, HTTP caching, and more. Nginx is easy to use and configure, and can run on a variety of platforms. Nginx is a popular choice for web developers and system administrators.