Nginx (pronounced "engine X", /ΛΙndΚΙͺnΛΙks/ EN-jin-EKS) (stylized as NGINX or NginX) is a web server that can also be used as a reverse proxy, load balancer, mail proxy, and HTTP cache. Nginx is free and open-source software, released under the terms of a BSD-like license. A large fraction of web servers uses NGINX often as a load balancer.