The modestly named Yaws - "Yet Another Web Server" - is an open source Erlang Web server known for its reliability, stability, and scalability. It started in 2001 as the brainchild of legendary Erlang programmer Claes "Klacke" Wikström, who also invented several important Erlang features, including Erlang term storage (ets), Distributed Erlang, the Mnesia database, and the Erlang bit syntax. Yaws is a general-purpose HTTP 1.1 Web server consisting of a relatively simple core surrounded by implementations of a wide variety of features such as file serving, response streaming, AJAX support, websockets, support for CGI and FCGI, and application embedding. This column details some of the features of Yaws. © 2011 IEEE.