Nginx (pronounced "engine X", /ˌɛndʒɪnˈɛks/ EN-jin-EKS) (stylized as NGINX or nginx or NginX) is a web server which can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache. The software was created by Igor Sysoev and first publicly released in 2004. A company of the same name was founded in 2011 to provide support and Nginx Plus paid software.
Nginx is free and open-source software, released under the terms of the 2-clause BSD license. A large fraction of web servers use NGINX, often as a load balancer.