It is hard to imagine the Internet without web servers. They allow you to browse websites, fill out forms and use other online services. Depending on the configuration, web servers can perform various functions in the architecture of websites. Regardless of the above, their configuration affects the performance and speed of access to the services.
The most popular web servers include Apache, Nginx, and IIS, but there are also many new solutions, sometimes dedicated to other specific technologies. Often, web servers are additionally supported by other technologies designed to further accelerate the service by caching content (e.g. Varnish or CDN services) or spreading traffic among groups of web servers (e.g. HAProxy). Many of these technologies are also available as turnkey services in a cloud environment.