Cowboy is an open-source, small, fast, and modular HTTP server designed to handle a large number of simultaneous connections efficiently. Built on top of the Erlang programming language, it provides a feature-rich and lightweight web server that is optimized for low latency and high concurrency. Frequently used in real-time web applications, Cowboy offers support for WebSockets, HTTP/2, and RESTful services.

Internet Information Services (IIS) is a Microsoft product available for use only on Windows. It is a web server that can meet the varied needs of the user. It is designed to be flexible and high functioning. IIS is commonly used by businesses for the purpose of interactive web-based applications.

IIS utilizes different standard languages and protocols. It helps users with the creation of different elements and uses a basic communication protocol for easy exchange of information. It is also recognized for its high-quality security by way of SSL. It uses File Transfer Protocol (FTP) and Simple Mail Transfer Protocol (SMTP) as well.

Comparison Cowboy vs IIS