Nginx

Nginx (pronounced 'engine-x'): A high-performance, open-source web server, reverse proxy, and load balancer built on a fast, event-driven architecture.

Nginx is your essential tool for scaling web applications: it handles high-concurrency traffic efficiently. Unlike traditional servers, its event-driven, asynchronous model allows it to manage over 10,000 simultaneous connections with minimal overhead (e.g., ~2.5 MB per 10k inactive keep-alive connections). Its core functions include serving static content, distributing load across backend servers (load balancing), and acting as a secure gateway (reverse proxy) for applications, including Kubernetes Ingress Controllers. The software, originally created by Igor Sysoev and released in 2004, is a reliable, low-latency foundation for modern, distributed systems.

https://nginx.org