What Nginx is
Nginx, pronounced engine-x, is a popular open-source web server software. A web server's basic job is to receive requests from browsers and send back web pages, images, and other content. Nginx does this exceptionally well, and it also serves as a reverse proxy, load balancer, and more. Created by Igor Sysoev and first released in 2004, it now runs a large share of the world's busiest websites.
Why it was created
Nginx was built to solve a specific problem known as the C10k problem: handling ten thousand simultaneous connections on a single server, which older web servers struggled with. Earlier servers often created a separate process or thread for every connection, which used a lot of memory. Nginx took a different approach that let it serve huge numbers of connections efficiently, which is exactly what fast-growing, high-traffic websites needed.
The event-driven design
The secret to Nginx's efficiency is its event-driven, asynchronous architecture. Instead of dedicating a whole process to each connection and waiting, a small number of worker processes juggle thousands of connections at once, handling each tiny piece of work as it becomes ready. This uses far less memory and copes gracefully with traffic spikes, which is why Nginx can serve so much from modest hardware.
More than a web server
Nginx is often used for jobs beyond serving files directly. As a reverse proxy, it sits in front of other servers, receiving requests and passing them to the right place behind the scenes. As a load balancer, it spreads incoming traffic across several servers so no single one is overwhelmed. It can also handle encryption, cache content, and serve as a gateway for modern applications, making it a versatile piece of infrastructure.
Where it is used
Nginx is everywhere in web infrastructure. Countless websites run it as their front-facing server, and it is a default choice in many hosting setups and container images. It frequently sits in front of application servers written in languages like Python, Ruby, and Node.js, handling the public-facing work so those applications can focus on their logic. Its main rival is the older Apache HTTP Server, and many setups use one or the other.
The bottom line
Nginx is a fast, efficient web server that also works as a reverse proxy and load balancer, built from the start to handle enormous numbers of connections with little memory. Its event-driven design is why it powers so many of the internet's busiest sites. Understanding it explains a key piece of how web requests travel from your browser to an application and back.
Related on Skillo
See also: What is a load balancer? Explained, What is a reverse proxy? Explained.
Sources
Published date reflects the original event date (2026-10-23). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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