Nginx is a popular, open-source web server, also commonly used as a proxy-server.

Unlike Apache servers, Nginx relies on asynchronous processes. Moreover, it does not have a decentralized configuration system. Both of these features makes the performance in handling static requests extermely efficient.

Currently, it is the most commonly used web server solution, and statistics show that its popularity is still growing.

More info:

--Apache vs Nginx: https://serverguy.com/comparison/apache-vs-nginx/ --Wikipedia: https://pl.wikipedia.org/wiki/Nginx